aheadadj.
英 ə'hed | 美 ə'hɛd
中文adj. 向前；在前的；领先\nadv. 向前地；领先地；在（某人或某事物的）前面；预先；在将来，为未来
向前；在前的；领先
adv. 向前地；领先地；在（某人或某事物的）前面；预先；在将来，为未来
词根词源
ahead (adv.)1620s, "at the head, in front," from a- "on" (see a- (1)) + head (n.). Originally nautical. To be ahead of (one\\'s) time attested by 1837.
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