It then floats to the surface of the pond, allowing it to be skimmed off like cream and turned into biodiesel.

然后，油便漂浮在池塘表面，很容易的便可以像油脂一样被刮起来，转变为生物柴油。

youdao

I was hence allowing 'the cream of my subject' to be skimmed off.

我这等于让人把“我的题目中的精华”撇了去。

youdao

What would be so bad if we just skimmed a little cream off the top?

NEWYORKER: Great Experiment