God's in his heaven—All's right with the world!
Mathematics teaches us to think logically and to approach problems systematically.
有机化学现在足以让人发疯。它给我一种原始热带森林的印象,充满了最非凡的事物,一个巨大而无边的灌木丛,没有逃脱的方法,人们可能会害怕进入。