do their best

• conj. 竭尽所能(尽力)

do their best的用法和样例：

例句

1. My parents do their best to keep up the family tradition.
   我的父母为了保持家庭的传统竭尽全力。
2. There is no easy way to do business, and only those who do their best to win clients can win business.
   做生意无捷径可走，只有那些千方百计赢得客户的人才能赢得生意。
3. Doctors do their best to treat the sick, but they can't perform miracles.
   医生尽力治疗病人，但他们无法创造奇迹。
4. Many people think that enjoying school might spoil children for the real world, so they do their best to make it unpleasant.
   很多人认为惬意的学校生活会宠得孩子们不能适应现实世界，于是他们尽力使学校环境不那么称心以免惯坏了他们。