站不住脚的

He gave a lame excuse for being absent.

他找了个脚借口来解释缺席原因。

He tried to justify his absence with lame excuses.

他想用脚借口为自己缺席辩解。

I find your theory is untenable and it must be rejected.

我觉得你理论是脚, 必须予以摒弃。

This disproves the theory that children are purely imitative.

这证明认为儿童只会单纯地模仿理论是脚。

Only the most ingenuous person would believe such a weak excuse!

只有最天真人才会相信这么一个脚借口!

This argument, however, does not hold water.

但是,这种观点是脚。