onlyone

Let't fight one-on-one！  来单挑！

A: Let's go, you and me, let's fight one-on-one!

B: All right, leave the others alone. It's between you and me.

onlyone

I'm in: 算我一个。

此习语相当于I'll take part in this activity. 如：

If you have enough people to play basketball, I'm in.

如果你有足够的人打篮球的话，算我一个。

onlyone

heart of gold：善良的心，好心肠

  Tom said that his friend Suzy has a heart of gold because she always helps those people in need.

汤姆说他朋友苏西心地善良，因为他总是帮助那些有需要的人。