First, we need to know how the mass of Hell is changing in time.

首先，我得知道随着时间的变化，地狱到底聚集人数的变化。

youdao

First, we need to know how the mass of Hell is changing in time.

首先，我得知道随着时间的变化，地狱到底聚集人数的变化。

youdao