Back welding
[化] 封底焊
🧩 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;
a. 焊的\\n[机] 熔接, 焊接, 锻接
🗣️ 情景例句
We have a very important meeting on at the moment.
现在我们正在开一个非常重要的会。
The Senator acceded to his defeat before the end of the election.
那位参议员在选举结束以前就承认落选了。
This platform would serve as a port and a railway station.
如果再建些伸出海面的高大的烟囱状通风管，