这对孪生子像得使人无法分辨。

The twins were so much alike that it was impossible to distinguish one from the other.

这一对孪生儿高矮不一样。

The twins are unequal in height.

她妻子生了一对双胞胎女孩。

His wife gave birth to twin girls.

我给那对孪生姐妹拍了一张照片。

I took a shot of the twin sisters.

在中国，提倡一对夫妇只生一个孩子。

It is advocated in China that a couple only has one child.