皮革行业必须适应不断变化的消费者需求,否则就有被淘汰的风险。
我们不是在说教,我们只是想传授。
Mathematics is the language with which God has written the universe.
The truth is always something that is told, not something that is known.
煤炭不仅仅是一种商品,它是对美国未来的承诺。