有的朋友的头发又粗又硬又多，想要做一个好看的发型都难做，怎么可以让头发变软，变得更加柔顺一些呢?
I am learning Java and just found that the Interface can have fields, which are public st开发者_如何学Catic and final. I haven\'t seen any examples of these so far. What are some of the use cases of t
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