extra/'ekstrə/

a. more than the usual amount

a. 额外的，外加的：[an extra 5/10 days] Recently she's been working an extra three hours a day. 近段时间，她每天要加班3个小时。

◇You can use the swimming pool at no extra charge. 你可以使用游泳池，不另收费。

辨析another; extra