You just stay away from me please.

山溪里的水随着季节常涨常退，不明事理的小人反复无常。

我不需要任何人的允许来做自己。

Understanding the past is essential for designing policies that can shape a better future.

With each advancement in ultrafast lasers, we rewrite the textbook on how atoms and molecules behave.

大街几乎是对的。