It was a heavy study load for them to understand the knowledge in a short time.

这是一个沉重的学习负担，让他们在很短的时间内了解的知识。

youdao

It was a heavy study load for them to understand the knowledge in a short time.

这是一个沉重的学习负担，让他们在很短的时间内了解的知识。

youdao