chinese is not easy for me ,but i like it very much .i 'm going to work hard at it.

问题描述:

chinese is not easy for me ,but i like it very much .i 'm going to work hard at it.
请问这句中的work hard at 是什么意思?

Chinese is not easy for me ,but i like it very much .I 'm going to work hard at it.
中文对我来说并不容易,但我很喜欢它.我要努力学习它.
work hard at 努力学习work hard at 和work hard 什么区别呢,分别举两个简单的例子好吗?