确实需要从小打好基础。

我的中文英文基础都不好，作为交流工具勉强过关，作为语言艺术，就一文盲 :))

Your knee still bothers you? Did you try physical therapy? Good ones really work. I injured my right shoulder once from playing softball. I went through a 3-month physical therapy session. And it's almost 100% now. It used to give me a sharp pain whenever I accidently trwisted my arm at an certain angle.