His strange habit makes sense when you consider that he's an environmental scientist who studies how to reduce litter, including things that fall off garbage trucks as they drive down the road.

他是一位研究如何减少垃圾的环境科学家，其中包括研究减少垃圾车行驶时掉下来的东西，当你考虑到这一点，自然就能明白他为什么会养成这种奇怪的习惯了。

youdao

Use old newspaper to line your Kitty litter box or your kitchen garbage can.

用旧报纸垫你的猫沙盒或厨房垃圾桶。

youdao

Now, let us to protect their homes, and we don't throw rubbish every day, if littering, will lead to our earth will be become garbage, so, we don't litter.

现在，就让我们来保护家园吧，我们每一天都不要乱扔垃圾，如果乱扔垃圾，就会导致我们地球就会被成为垃圾地球，这样，我们就不要乱扔垃圾。

youdao

You know how in most cities when you walk around there are garbage cans that you use to throw away litter?

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