the barber recommended me a special shampoo to (strength) my hair中间的单词怎么变?

问题描述:

the barber recommended me a special shampoo to (strength) my hair中间的单词怎么变?

strengthen
理发师给我推荐了一种香波来使头发更强韧.中间括号的单词怎么换呢?谢谢。。strengthen, 加强的意思,上面写了啊。