拦路木的英文：
barrier

A weak barrier,defence,team
不结实的挡板、无力的防御、弱队

A train plowed into the barrier at the end of the platform.
火车撞上了月台尽头的栅栏。

As a result, no barrier can stop you.
结果，不再有障碍能阻挠你。

The Amazon basin is a huge barrier to commerce.
亚马逊流域是两国进行贸易的巨大障碍。

I don't understand why the knee is a barrier.
我不理解为什么非得以膝盖为界线。