O-14：once or twice 一两次
A:Anything wrong with Tom?
A:汤姆有什么不对劲吗？
B:Why do you ask?
B:为什么这么说？
A:I saw him sign once or twice and then he went away without a word.
A:我发现他叹了几次，一言不发地走了。
B:What had happened? Let me think.
B:发生什么事了呢？让我想想。
A:Is there something we can do to help him?
A:有什么是我们可以帮他的吗？
B:Let's call him out, OK?
B:我们把他叫出来，好吗？
A:Right.
A：好。
