If you don't believe me, let's have a competition and see.

不信咱俩比试比试。

Why don't we have a competition?

你也来和我一比高低啊。

We'll have a competition, with teams.

接下来我们将进行小组比赛。

Today we have a competition. And we won, so we needn't do homework.

今天我们有竞赛。我们又赢了，所以我们又不用做作业。

Wang Ping: it means not to be too apparent and have a competition secretly.

王平：就是不要太明显，要暗暗比试的意思。