children的复数形式

　　The child disappeared from his home some time after four.

　　这孩子四点多的时候就离家不见了。

　　By law, you are a child until you are 18.

　　按照法律规定，18岁之前是未成年人。

　　I was pregnant with our third child at the time.

　　当时我正怀着我们的第三个孩子。