量力而為 english is....?

量力而為 = do your best
勉強自己 = force myself

量力而為 english is....?
Do your best but limit to your utmost ability

勉強自己 = ?
Forcing yourself.

量力而行 do according to one's abilities

量力而為 =act according to [someone]'s ability
(解作按自己的能力去做)

勉強自己 = manage [my/him/her]self with an effort
(解作雖努力但不過勉強了自己)

量力而為=to act according to one's ability
http://hk.dictionary.yahoo.com/search.html?q=1&s=%B6q%A4O%A6%D3%AC%B0勉勉強自己= manage
管理;經營;處理
scratch
抓;搔
tear oneself away
勉強使自己離開

http://hk.dictionary.yahoo.com/list.html?s=%ABj%B1j%A6%DB%A4v

I hope i can help you!

量力而為 = to do your best in something
勉強自己 = to push yourself to do somthing