extra

adv. 特别地，非常；另外

n. 临时演员；号外；额外的事物；上等产品

adj. 额外的，另外收费的；特大的

中文词源

extra 额外的

ex-, 向外。-ter, 比较级后缀，见alternate.

extra: extra: [18] In its modern English use, ‘beyond what is normal’ or ‘additional’, extra is probably an abbreviation of extraordinary [15], in which the prefix represents Latin extrā ‘outside, beyond’. This in turn was short for exterā, the ablative feminine case of the adjective exterus ‘outer’ (from which English gets exterior [16]). And exterus itself began life as a compound form based on Latin ex ‘out’.
=> exterior, extreme
extra: 1650s as a stand-alone adjective; also used as an adverb and noun in 17c. (see extra-); modern usages -- including sense of "minor performer in a play" (1777) and "special edition of a newspaper" (1793) -- probably all are from shortenings of extraordinary, which in 18c. was used extensively as noun and adverb in places extra would serve today.

2. The President is determined "to go the extra mile for peace".: 总统决心“为实现和平而加倍努力”。

3. There's an extra blanket in the bottom drawer of the cupboard.: 壁橱最下面的抽屉里还有一条多余的毯子。

4. Police warned motorists to allow extra time to get to work.: 警方告诫驾车者出门上班要留出富余时间。