child是可数名词。children是child的复数。
childn.儿童；小孩；子女；儿子
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。
水利万物而不争,
而万物莫能与之争。
