Concaveness
n. 凹面, 成凹形
? 同義詞
??? 情景例句
Well, are you going to tell me what's on your mind, Harry?
好了， 你要不要告訴我你在想什么， Harry？
I'm sure I've forgotten something ,but it's too late now.
我肯定我忘記了一些東西，但是它現在是太遲了的。
If I continue to play a lot of concerts over the next five year.
如果在今后的五年內我連續舉辦一些音樂會。