如何使用 "both" 造句

1. They are both his daddies .: 他们都是他的爸爸。

2. It would look better than both .: 但又比这两者更好。

3. I believe it was both .: 我认为两者都有功。

4. Both positions are firmly held .: 双方立场都很坚定。

5. Both companies declined to comment .: 两家公司都拒绝发表评论。