名词 extra:

1. a minor actor in crowd scenes

2. an additional edition of a newspaper (usually to report a crisis)

3. something additional of the same kind

形容词 extra:

1. more than is needed, desired, or required

2. added to a regular schedule

3. further or added

副词 extra:

1. unusually or exceptionally

extraadj.额外的n.额外之物；临时演员adv.特别地extra fuel额外燃料extra ball奖励球extra risk特别风险；额外险extra time额外时间；加时赛extralegaladj.不受法律支配的Extraetion提取extra rays[电] 异常射线extraverts外倾个体extra highadj.超高的extra play附加层

extra instruction广义指令

extra point额外得分

extra quality特优质量

extra order附加位

extra work额外工作

extra pulse过脉冲

column extra柱附件

extra loss额外损失

extra limiter外加限止器

extra cost额外成本,追加费用

extra hardadj.超硬的

extra charge附加负载； 附加费

extra hole额外穴

extra heavyadj.超重的(超功率的)

extra hand[经] 临时雇工

extra wheel备用轮

extra ply附加层

extra fineadj.超级的(极优的；高级优质的)

extra duty超负荷

extra time额外时间；加时赛