how to distinguish 'see', 'watch' and 'look'? i learned watch a movie,watch a film.and i know it would not say look (at?) a movie,or seldom to say see a film, see a movie.but they both have same meaning in chinese:看 so what's the difference? thanks a lot!

How to run that can keep your leg thin(or slim?) Some people say that running is an holistic sport, but the fact is that so many people slim(?) their upper part of the body, while their leg become more and more thick. So i write something about that. Reason number1 of thick leg: Wrong realization of moving forward the center of gravity.( Wrong realization of ahead of center of gravity) When you are running, you have to take your center of gravity forward. You can have a try: move your center of gravity forward when you in standing position. I believe that most people will become you only moving the center of gravity of your upper part of the body(----(your feet)you still standing in situ, it’s not truely taking your center of gravity forward. If you do it right, you might want to step forward so that you could keep balance and prevent a tumble----this also the original intention of walking. This problem relate the lacking of realization of moving forward the center of gravity. You can only feel more relaxed when you keep moving your center of gravity forward while you running. If you just only move your upper part of the body, your arse still hold backward, then every step you run your center of gravity at the back. It makes you feel very laborsome, so no wonder your thigh will become thick, because your leg need a stronger power to push you to finish the action. TBC The original text from Zhihu,written by Gaoke:https://zhuanlan.zhihu.com/p/20638087 I try to translate it,but my English is so poor,so please help me to correct it. Thank you very much! Some words or expression i am not sure which i should use that i write it in bracket. and this one part of original text: 大家都说跑步是整体运动，但实际情况是很多人上半身瘦了，但是腿越跑越粗，然后我写篇这个相关的内容好了。 粗腿的原因一-错误的重心前移意识： 跑步的时候需要重心前移，大家可以试试站立位置重心前移。相信很多人会做成上半身前移重心，还留在原地，而不是重心前移。如果是正确的重心前移，你会自然跨出去一步来保持平衡和防止摔倒，这也是走路这个动作的初衷。这样的问题与缺乏重心前移的意识有关。跑步的时候只有保持持续的重心前移，才可以不费力的跑。如果你是上半身前移，但屁股往后压，这样每跑一步的重心都在后面，你的跑步将会非常费力，大腿必然要很粗壮，带来更强的力量来推动你完成动作 作者：高科 链接：https://zhuanlan.zhihu.com/p/20638087 来源：知乎 著作权归作者所有。商业转载请联系作者获得授权，非商业转载请注明出处。