We'll have to double up on books; there aren't enough to go around.

　　因為書不夠人手一冊，我們只好合用了。

　　He scarcely earns enough to keep himself and his family.

　　他掙的錢幾乎不夠養活他自己和家人。

　　Our plans need to be flexible enough to cater for the needs of everyone.

　　我們的計劃必須能夠變通，以滿足每個人的需要。

　　I was stupid enough to believe him.

　　我可真夠糊涂的，竟然相信他的話。

　　I wouldn't get involved ─ he's old enough to fight his own battles.

　　我不想參與——他已經長大，能獨自應付了。