Back-ups
(back-up 的复数) [计] 后援; 备份\\n[医] 后盾(在大气中高压电流所通过距离)
🧩 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;
不间断电源\\n[计] 不间断电源
🗣️ 情景例句
Millie, did you bring the tapes for dancing?
Millie，带来了跳舞的录音带吗？
Would you like to leave a message?
你想要留下口信吗？
I was doing some exercises on the high-and-low bars. When I landed, I fell forward and hurt myself. Someone was standing too close and I knocked into him and fell over onto my shoulder.
我当时在高低杠上练习。落地时向前摔倒受了伤。有人站的离我太近，我撞在他身上，跌了一跤，肩膀也受了伤。