Underboarding
垫板, 衬板
🗣️ 情景例句
About forty minutes, I think.
我想大约40分钟。
I got many channels on the TV set.
我的电视机有很多频道。
We can offer a 10% discount for orders over 10000 pieces.
订购一万个以上，我们可以打九折。