Underframing
底层框架的材料或结构部件
🗣️ 情景例句
young and old.
不管是年轻的， 还是年老的。
Does the back door have a lock on it?
后门上有锁吗？
He was absent on Monday,Tuesday,Wednesday and Tuesday.How are you all keeping?
星期二、星期三和星期四没去上学。你们身体都好吗？