評論
打印
Egg Cells
卵細胞
Do you know what an egg cell is?
你知道什么是卵細胞嗎？
An egg cell is necessary for reproduction.
卵細胞是繁殖的必要條件。
Animals have egg cells.
動物有卵細胞。
Then does every animal have egg cells?
那么每個動物都有卵細胞嗎?
No, they don't, only female animals have egg cells.
不是的，只有雌性動物有卵細胞。
Male animals have sperm cells instead.
雄性動物有精子細胞。
When an egg cell meets a sperm cell, they work together and creat a new animal.
一個卵細胞遇到精子細胞后，它們共同努力創造出新生命。
Can an egg cell alone create a new animal?
一個單獨的卵細胞能創造出一個新的動物嗎？
No, it always needs a sperm cell.
不能，要有精子細胞才可以。
Usually,one egg cell and one sperm cell become one animal.
通常情況下，一個卵細胞和一個精子細胞會創造出一只動物。
However, sometimes they split into two, and become two anminals, we call these animals twins.
但有時，它們會分裂成兩個細胞，創造出兩只動物，我們稱它們為雙胞胎。
