Give the pupils something to do, not something to learn; and the doing is of such a nature as to demand thinking; learning naturally results.

煤炭建设了这个国家，煤炭也将保持它的强大。

对我来说，梦就是自然的一部分，它无意于欺骗，而是在尽力表达什么。

Materials themselves are not important; what matters is how you use them.