I can build class stock, and I can test class stock, before I have a class market.

我可以建立一个stock类，然后在有macket类之前测试这个类。

youdao

I can build class stock, and I can test class stock, before I have a class market.

我可以建立一个stock类，然后在有macket类之前测试这个类。

youdao