try one's best to do sth.
要尽力去做某件事情的意思.例句：
I'll try my best to help you.
I'll try my best to pass the exam.
Keep quiet,dude,I'll try my best to get that girl.
等等.
注意,该用法非常口语化,请日常生活中经常用到.代表着让别人放心,自己一定会办成某件事情.