蝌蚪妈妈把卵产在叶子上，慢慢的变成小蝌蚪，小蝌蚪生长出前腿和后退，尾巴慢慢退去，变成了青蛙。
Hey, stop!
嘿,住手！
Do not harm my babies.
不要伤害我的孩子。
Stop it.
快停下。
Let us study about the eggs.
让我们学习关于卵的知识。
A female frog lays hundreds of eggs, after which the male fertilizes them.
一只雌蛙产卵数百枚，然后雄蛙使其受精。
Some of these eggs get destroyed on exposure to wind and rainfall.
一些卵暴露于风雨中会被破坏。
Therefore, out of hundreds of eggs, only a few get fertilized.
因此，在数以百计的卵细胞中，只有少数能够受精。
A layer of jelly holds the eggs together,and provides protection to the eggs. This whole mass of fertilized eggs in the jelly is called a spawn.
一层透明胶状物把卵粘在一起，为卵提供保护。胶装物中的受精卵被称为卵。
Thanks for the information.
谢谢告诉我这些。
Please come back after few weeks.
请几周后再来。
Few weeks later…
几周之后……
Hi, how are you?
嗨，你好吗?
Hi, you are just in time.
The eggs are about to hatch.
嗨，你来得正是时候。卵就要孵出来了。
After a few days, the tadpole hatches out of the egg.
几天后，蝌蚪从卵里孵化出来。
It feeds on the yolk of the egg from which it hatches.
它以孵化出的卵黄为食。
After a few days, external gills appear.
几天后，外部的鳃出现。
Tail elongates.
(Wow! My tail has increased!)
尾巴边长了。（哇喔，我的尾巴变长了！）
Fins develop.
生长出鳍。
External gills disappear.
（Oh, Where did my gills go?）
外部鳃消失。
（噢，我的鳃到哪里去了?）
After a few weeks, tadpole develops hind limbs.
(Yes, I have got hind limbs.)
几周后，蝌蚪长出了后肢。
(是的，我有后肢啦。)
( Oh! What is happening to me? )
(哦!我怎么了?)
After a few days, a tadpole develops into a froglet.
( Wow! I feel like a grown-up! )
几天后，蝌蚪长成了小青蛙。
(哇!我觉得自己像个大人!）
Develops forelimbs.
( This is so amazing!! )
长出前肢。
(这太神奇了!!)
Develops lungs for breathing.
开始用肺进行呼吸。
Final stage:
Tail becomes smaller and finally disappears.
( Where did my tail go? )
最后阶段：
尾巴变小了，最后消失了。
(我的尾巴跑哪儿去了?)
Frog enters the adult stage.
青蛙进入成年阶段。
Hey, congrats! You’re an adult now.
嘿,恭喜!你现在是一只成年蛙了。
Thank you!
谢谢你！
Now, you know all about a frog’s life cycle:
现在，你知道了青蛙的生命周期:
Fertilised egg, Early Tadpole, Tadpole with gills and fins
, Tadpole with hind limbs, Froglet, Froglet with reduced tail, Adult frog.
受精卵，早期蝌蚪，有鳃和鳍的蝌蚪、后肢蝌蚪、小蛙、尾巴缩小的小蛙、成年蛙。
1. fertilize 使受精；
2. tadpole 蝌蚪；
3. gill 鳃；
4. fin 鳍;
5. hind limb 后肢；
6. froglet 幼蛙，小蛙；
**************************************************************
给孩子的自然生命科学课： From Caterpillar to Butterfly 毛毛虫变蝴蝶
给孩子的自然生命科学课：How Plants Make Food 植物如何给自己做食物
|
|
