“设岗”造句

这个地方不太安全, 因此他们想设岗于此.
This place was not very safe, so they wanted to post guard.

这地方不太安全, 因此他们想设岗由此.
This place was not very sofe, so they wanted to post guards.

他们在门口设岗.
They posted guards at the door.