1， in theory 在理论上
It works in theory 它在理论上是可行的
2， in time 及时
I will be here in time 我会及时到这里来
3， lay eggs 下单
The hen lays eggs every day 这只母鸡每天都下蛋
4， give birth to 分娩
She gave birth to a son last night 昨晚她生了一个儿子
5， in one's turn 轮到某人
You can speak up your turn 你可以轮着发言
6， prevent 。。。from 阻止
We can prevent him from smoking 我们能阻止他吸烟
7， now what 既然
Now what you have your own decision ，you must work hard 你既然有了自己的决定，你就必须努力工作
8， break out 爆发
The war broke out in 1926 这个战争爆发在1926
9， as gentle as a dove 极温顺
The horse is as gentle as dove 这匹马极其温顺
10， by spaceship 乘坐宇宙飞船
You can get to the moon by spaceship 你可以乘坐宇宙飞船去月球
11， block out 挡住
The pair of sun glasses can block the sun out 这幅太阳眼镜能挡住太阳
12， get the hang of 掌握
He can get the hang of the language 他能掌握这门语言