Underlayment
n. 地毯衬,屋面衬垫材料
🗣️ 情景例句
Under these conditions of payment,-
在这种付款条件下，-
I tried to call you, but the line was busy.
我试着给你打电话，但老占线。
Just let me know which day.
决定好哪一天就告诉我。