英语语法分析

We just harvest them and grow a bunch in a 42-gallon (160-liter) barrel, so we can spray it out in a food-rich environment.

我们只需要收割它们，然后在一42加仑（160升）的桶中种植一大批，这样我们就能把它们洒在一个食物丰富的环境里。

Economics is precise about the tax that should, in principle, be levied to deal with negative externalities: the tax on a liter of fuel should be equal to the harm caused by using a liter of fuel.

从经济学的角度来看，为了应对负外部性，原则上应该征收的税收是准确的：对一升燃料征收的税应该等于使用一升燃料所造成的危害。

Sadly, the scientists found 1800 pieces of microplastics per liter of (每升) snow.

遗憾的是，科学家们在每升雪里发现1800粒塑料微粒。