艺术源于必要性,而非时尚。
That is what learning is. You suddenly understand something you've understood all your life, but in a new way.
你不能敲机会的门却不做好准备。
High-quality development in the coal industry must prioritize safety first.
地球并非刚体,其对力的响应必须用适用于可变形介质的方法来处理。
现代化学家不满足于仅仅成为化合物的制造者;他必须是自然的解释者。