Backstep welding
[化] 分段退焊
🧩 词语组成解析
后退
a. 焊的\\n[机] 熔接, 焊接, 锻接
🗣️ 情景例句
Hold Gerald's hand, please. Great!
请握住Gerald的手。很好！
The problem has been bothering me for weeks.
那个问题已经困扰了我几个星期。
Look at those black clouds. It's going to rain.
看那成堆的乌云，要下雨啦！