fall short (of)

1) 不够长；缺乏

We could not save the boy, because the rope fell short.

因为绳子不够长，我们没能救那个男孩。

Provisions fell short.

粮食不够了。

2) 没打中目标；赶不上

The arrow fell short.

箭未中的。

Your work falls short of my expectation.

你的工作没能满足我的期望。

When we really involved in the field we have studied, we would always find our falling short ofexperience.