Because it's an easy problem to put together.

因为这是一个很简单的问题。

youdao

And it's not an easy problem.

这不是个容易解决的问题。

youdao

Take methane. Its an easy problem to deal with.

以甲烷为例，对付它并不难。

youdao

Take methane. Its an easy problem to deal with.

以甲烷为例，对付它并不难。

youdao