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
What are you going to do about your appointment
那怎么办
Have you marketed your product yet?
你们的产品尚未推出市场吗？
It makes no difference that the forgery may have been a very skilful one:
即使伪造得很巧妙，也不能付款，