Arcing back
[电] 回弧
🧩 词语组成解析
[机] 电弧作用
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;
🗣️ 情景例句
The first chopsticks were made from bone and jade.
第一批筷子是骨头或玉制成的。
Good afternoon, sir.
下午好，先生。
I know. I can help him with most of his subjects.
我知道。我可以帮助他学习绝大多数科目。