"Playtein refers to mature sexual cells produced by the reproductive system when organisms undergo sexual reproduction, referred to as germ cells..."

There was a sound like a natural sound in my ears, and the tip of my nose was surrounded by the unique body fragrance of a girl.

My sister Ling and I were studying in the bed.

It's great to have a capable sister.

This is what I think now. I review before the exam. It won’t work without Ling’s help.

The dna replication and reorganization that sounded boring originally became much more interesting under Ling's explanation, and because I was surrounded by a beautiful girl, I was surprised to be attentive.

"Hey......pervert, don't get distracted."

Just as I was thinking a little distracted, Ling knocked me.

"Oh, sorry, I just think it's great to have you around."

I said slowly to my sister.

When she heard my words, she was a little stunned, then stopped looking at me, and her slender fingers flipped the pages again.

"Learn quickly... the sweet talk guy..."

My sister blushed and urged me dissatisfiedly.

"Uh... OK."

I agreed, "Oh, this is my truth. It's great to have such a capable sister by my side. When I have any doubts or difficulties, I can ask her for advice.

"There is a last part of the concept I want to tell you - finally let me talk about the difference between RNA and DNA."

Ling flipped through the thick book of biology and found a huge single spirochete, with many very disgusting blocky proteins condensing on it. I know, this should be RNA.

"The main differences between RNA and DNA are morphological and functional...DNA is a double helix..."

My sister explained it carefully little by little

——"Did you understand? God..."

After finishing her speech, she turned her pretty face and looked at me and asked.

"Yeah, I understand."

I nodded and said, the whole knowledge about reproduction and inheritance feels very clear now.

"Okay, let's check you later. Before that, let's practice the words."

“The word… OK.”

I received my sister's next training.

Because it is an international department, it teaches in English when taking courses in the US. If you don’t understand some words and pronunciation, you won’t even understand the class...

"Let's get to know these words first. God, I've sorted it out for you. There are a total of forty words in this unit and I've memorized them in five minutes."

Ling handed me a small notebook, which was filled with forty words in elegant fonts, and there were Chinese definitions and phonetic symbols next to it. My sister was really attentive.

"Uh, I can't recite it in five minutes..."

"Try to get to know it, and you will know the meaning of Chinese when you see it."

"Okay, give it a try."

I said, then I held my breath seriously and looked at the words, while my sister looked at me from the side.

I can't let Ling down my expectations. I finally sorted out so many words for me.

Thinking of this, my brain's thoughts gradually got faster, and every word was clearly reflected in my pupils, quickly remembering...

"Five minutes are here."

Ling said, I handed her the word book and remembered about thirty English words in Chinese. It was my limit to be able to be so fast.

"Okay...what else can I learn."

I asked to the tutor of my lovely sister.

"Practice vocalization..."

"Voice practice... OK."

Another task Ling gave me was to practice vocalization.

“Switch off the light.”

Just as I was looking at the phonetic symbols of the words and thinking about how to pronounce them, Ling issued further instructions.

Turn off the lights?

Ling Hong's lips opened lightly and said.

"Uh, why do you need to turn off the lights when doing vocal exercises?"

I asked her in confusion.

"It is said that darkness can enhance people's imagination and memory, so... let's turn off the lights and practice."

Ling explained it again, right, it’s true that in the dark, his thoughts will become more active.

"good."

I nodded and climbed to Ling's bedside.

"I've turned off the lights."

"Um."

Ling nodded, then I raised my hand and pressed the button at the head of the bed. The lights that illuminated the surroundings suddenly went out, and my vision was shrouded in darkness.

It is said that when the field of vision is dark, you can see some things around you by closing your eyes slightly for more than ten seconds and opening it for more than ten seconds.

I slowly closed my eyes, and suddenly I felt that my hearing became much more sensitive, and I could feel my heartbeat and my orderly breathing sound.

"Okay... Let's start practicing vocalization."

Ling also paused for a moment, then said to me.

I opened my eyes and everything around me was no longer so dark. I could see the shallow outlines around me and Ling's pretty face half hidden in the darkness.

"Well, let's start, I'll read it once, God, you read it once."

My sister and I were facing each other in the dark, and she slowly said to me.

"Okay... But Ling, can you remember it if you don't read it?"

"Remember."

She said, this is really strong in my memory, and I can read the words directly.

“Reproduction—reproduction.”

Ling made a very standard British pronunciation.

“reproduction”

I read it again, but I couldn't read Ling's elegant feeling.

"Do it again, read it slowly—reproduction."

Ling guides the way.

“reproduction.”

I worked very hard and read it again with caution.

"Gamete-gamete."

"gamete."

"I feel like my brother is not attentive enough when pronouncing the phonetic symbols of [u] and [a]."

"Well, it's not easy to pronounce these two phonetic symbols..."

"I'll teach you."

"Um."

Ling said carefully, have you started to teach me the sound of each phonetic symbol gradually?"

“a——(Chinese pronunciation is the same as “ah——”)”

Ling whispered.

“a—”

I also said, that's fine.

"Not good enough... God, please use more force, a-"

Ling taught me that I coughed twice and continued to make a sound.

“a—”

This should be fine.
To be continued...