That's a mean trick.

这法子真损。

He played a mean trick on us.

他对我们耍了一个卑鄙的花招。

That was a mean trick.

那是一个卑鄙的骗局。

That was a mean trick!

那是一个卑劣的诡计！

That was a mean trick!

那是卑鄙的诡计。