每一种化合物都必须有确定的组成，这可以用其元素的符号来表示。
It is not the criminal things that are hardest to confess， but the ridiculous and shameful things.
As you grow older, you will discover that you have two hands, one for helping yourself, the other for helping others.
The truth is not always the easiest thing to believe.
做出伟大工作的唯一方法就是热爱你所做的事。
文化生态学与人类生态学的不同之处在于它强调文化被修改的适应过程。
The future of food security lies beneath the waves, if we're wise enough to cultivate it properly.