skimmed

We watched a child skimming stones across the lake.

我们看着一个孩子在湖上打水漂。

We've only skimmed the surface of (= considered a small part of) the problem.

我们只是粗浅地讨论了一下这个问题。

Strain the cooking liquid and skim off the fat.

把熬好的汤过滤，撇去油脂。