这是一个非常难的作业，作为自豪的原因之一是我完全熟练的掌握了数学模型。

This is a very difficult task, and one I am proud to have accomplished.

youdao

这是一个非常难的作业，作为自豪的原因之一是我完全熟练的掌握了数学模型。

This is a very difficult task, and one I am proud to have accomplished.

youdao