Costless
a. 没有成本的, 不需花钱的
✅ 同义词
🗣️ 情景例句
No, thank you. Please tell him to phone me when he comes back.
不了，谢谢。他回来时，请告诉他给我打个电话。
Do I have to take my pants off, too?
我也得脱下裤子吗？
The guests had, of course, realized this from the moment Bessie opened the door for them and, long before the final catastrophe, had had a difficult time trying to conceal their amusement.
客人们自然从贝西为他们开门那一刻起就看出来了，在好长一段时间里，即最后这个乱子发生前，他们努力克制才没笑出声来。