At the request of the students, the school toughened up campus patrols.

在学生的要求下，学校加强了校园巡逻。

The management rules have been toughened by company.

公司的管理细则近年变得严格了。

Becoming the candidate of the leader in this region is toughening.

成为该地区领导人的候选人越来越难。

Talks are under way to toughen trade restrictions.

加强贸易限制的会谈正在进行中。

They jab tree trunks to toughen their hands and practice squatting with other students sitting on their shoulders to build the leg strength.

他们猛击树干来锻炼双手，练习蹲坐，让其他同学坐在他们的肩膀上锻炼腿部力量。

This experience will toughen her.

这次经历会让他变坚韧。

A year in the army will toughen him up.

一年的部队生活会使他坚强起来。

It is not too late for him to toughen up.

现在采取强硬的措施尚未为时过晚。