1·Now I know what it is to shudder!
现在我知道害怕是怎么回事了！
2·Of course, but you know what it is like being a mother of a 13-year-old boy.
当然，但你知道作为一个13岁男孩的母亲是什么感觉。
3·They come to camp, wanting to know what it is like to be an astronaut or a pilot.
他们来到这个训练营，想知道当宇航员或飞行员是什么感觉。
4·"I don't know what it is to be hungry," said Mary, with the indifference of ignorance.
“我不知道饿着肚子是什么滋味。”玛丽带着一种漠不关心的无知说。
5·"That is all very well," said he, "but still I do not know what it is to shudder!"
“这很好，”他说，“但我还是不知道害怕是怎么回事！”
6·Women want to know what it is and why it is in so many brands of mineral cosmetics.
女性们想知道这是什么，为什么那么多牌子的矿物化妆品都有这成分。
7·It is a-i don't know what it is.
它是一个——我也不知道它是什么。
8·Ah, I don't know what it is.
我不知道那为什么。
9·We don't know what it is.
我们不知道是多少。
10·I don't know what it is.
但我不知道是什么。