root ·phrase

我们必须找到这个问题的根源。

We must get to ___the ___root ___of this problem.

金钱被称为万恶之源。

Money is said to be ___the ___root ___of all evil.

不幸的是，我们中没有人曾试图找到这个问题的根源，但它对环境的影响是显而易见的。

Unfortunately none of us has ever tried to find ___the ___root ___of this problem, but the influences that it has on the environment are obvious.