To sell horse meat as beefsteak is their usual practice.

挂羊头卖狗肉是他们的惯技。

What's your usual practice?

你们的惯例是怎样的？

It's the usual practice.

这是我们的惯常做法。

So I really have to stick to our usual practice.

所以我必须坚持我们的惯例。

That's the usual practice adopt internationally.

这是国际上采用的惯例。