There’ s no extra money for emergencies. 没有余钱来应急。

We need extra space for guests. 我们需要额外的地方招待客人。

As an extra precaution, I turned off the electricity. 作为额外的防范措施，我把电路切断了。

It’ s £20 for dinner, and drinks are extra. 晚餐费为20英镑，酒水费另计。