第三人称单数： toughens
过去式： toughened
过去分词： toughened
现在分词： toughening

It might toughen you up a bit .

或许能让你坚强一点。

Secondly , obama sought to toughen his line on iran .

其次，奥巴马寻求锻炼他的线就伊朗。

Let it toughen you up .

要让它使你变得更坚强。

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

他们打击树桩来加强自己的手臂力量，让其他学生坐在自己肩膀上面练习扎马步来锻炼自己的腿部力量。

Their methods include the use of strips of ion-exchanging plastic , braided with polystyrene to toughen them up ......

他们的方法包括利用聚苯乙烯加固的离子交换塑料带。