是try best to do，例如：
1、Now that the decision has been made， we must try our best to carry it out.既然已經作出了決定，我們就必須儘自己最大的努力去執行。
2、I'll try my best to free them from doubts and misgivings.我要盡力消除他們心中的疑慮。
3、You should try your best to avoid making mistakes while taking an important exam.你應該儘量避免在參加重要考試時出錯。
