这里有后门，走后门，他们就知道你警告我。

There's a back door. They'll know you warned me.

比如最近我们在商业系统里面就要搞个反对“走后门”运动。

For instance, we are soon going to begin a movement against backdoor dealings in the commercial sphere.

有些竞争者不择手段，编造假科研成果，派公关人员拉关系，走后门，黄委员在政协会议上说。

Some contenders, however, fake their research results, or hire public-relations specialists to lobby or even bribe judges, said Huang.