1、A police clampdown on car thieves hit a snag when villains stole one of their cars.
匪徒偷走了警方一輛汽車后，警方打擊盜車賊的行動遇到了一點兒小挫折。

2、We didn't expect to hit a snag before the machine was ready for production.
我們沒有預料到機器投入生產前會遇到意外困難。

3、However, I hit a snag this time.
但這次，我碰了一個釘子。

hit a snag翻譯