"I work harder at English than my sister does" 是一种表达方式。其中的 "work harder at" 意为 "在...方面更努力",是一种常用的表达方式。另外一种表达方式是 "I put more effort into English than my sister",其中的 "put effort into" 意为 "在...方面投入更多努力"。
例句1:
I work harder at English than my sister does.
我比我妹妹更努力学英语。
例句2:
I put more effort into my studies than my classmates.