Back-up
大学 College[计] 后援; 备份\\n[医] 后盾(在大气中高压电流所通过距离)
📖 牛津释义
back-up
n
1 [U] support; reserve 支持; 支援; 後备
The police had military back-up. 警方有军队作後盾.
[attrib 作定语]
back-up services 善後服务
the back-up team of a racing driver 赛车手的後勤队.
2 [U, C] (computing 计) (making a) copy of a file, program, etc for use in case the original is lost or damaged （制作）（文件、程序等的）复制件（以备原件丢失或损坏时使用）
[attrib 作定语]
a back-up disc 复制件磁盘.
🧩 词语组成解析
back
[bæk]
n. 背，背部;背面，反面;后面，后部;（椅子等的）靠背;
vt. 使后退;支持;加背书于;下赌注于;
vi. 后退;倒退;
adj. 背部的;后面的;以前的;拖欠的;
adv. 以前;向后地;
up
[ʌp]
adv. 在上面，在高处;起床，起来;向上;由低到高;
adj. 向上的;上升的;竖立的，垂直的;举起的;
vt.& vi. 增加;加速;提高;举起，拿起;
prep. 在…的上端;向高处;沿…而去;向…上游;
n. 上升，升高;兴旺，繁荣;上坡;（价格等）上涨;
🗣️ 情景例句
have been busy at work this morning
一早上都在忙着
No man can do two things at once.
心无二用。
He looked very well though he was rather thirsty, for he drank half a bottle of milk.
它看上去一切正常，只是口渴得很，喝了半瓶牛奶。