ease

她轻松赢得了400米比赛。

She won the 400m race with ___ease.

我对她学习语言的轻松程度感到惊讶。

I was amazed at the ___ease with which she learnt the language.

我对她学习语言的轻松程度感到惊讶。

I was amazed at the ___ease with which she learned the language.