他学东西快。

He learns things quickly.

youdao

尽管我没有他学东西快。可是，我投入更多的时间到学习中去，所以，我自信我不会落后于他。

Although I can not learn things as fast as him. However, I devote more time to my studies, so I am confident that I will not fall behind him.

youdao

他学东西不像他哥哥那么快。

He was not so quick a learner as his brother.

《牛津词典》

他学东西特别快。

He is a really fast learner.

youdao

他学东西特别快。

He is a really fast learner.

youdao