最简单的解释通常是最正确的。

The ___simplest explanation is usually the most accurate one.

这道数学题是最简单的，连小孩子都能解答。

This math problem is the ___simplest one, even a child can solve it.

他喜欢最简单的家具设计，没有任何多余的装饰。

He prefers the ___simplest furniture designs with no unnecessary decorations.