Courage consists not in hazarding without fear； but being resolutely minded in a just cause.

Man's survival, from the time of Adam and Eve until the invention of agriculture, must have been precarious because of his inability to ensure his food supply.

未来总是在变化，但过去总是一样的。

做出伟大工作的唯一方法是热爱你所做的事情。

要理解一个句子的意义，我们必须考虑说话者的意图和话语的背景。