a.

1. 额外的；外加的[B]
   I don't suppose they wanted any extra help.

   我想他们不需要额外帮助。

2. 另外收费的[F]
3. 特大的；特佳的

ad.

1. 额外地；另外
   They charge extra for wine.

   喝酒他们另外收费。

2. 特别地，非常地
   I have to be at the office extra early tomorrow.

   我明天必须很早就到达办公室。

n.[C]

1. 另收费用的项目；附加费用
   The dinner cost twenty dollars without the extras.

   除去额外费用，那顿饭花了二十元。

2. 临时演员
3. （报纸的）号外
4. 质量特别好的东西，上等产品

adj.

adv.

1. to a greater extent than usual.
2. in addition.

n.

1. an item for which an extra charge is made.
2. an extra item.
3. a person engaged temporarily to fill out a crowd scene in a film or play.
4. Cricket  a run scored other than from a hit with the bat, credited to the batting side rather than to a batsman.