可持续性必须有利可图，否则就无法持续——这是我们在现代农业中必须解决的挑战。
They just keep trotting back and forth across the bridge thinking there is something better on the other side. If they'd hang head down at the top of the thing and wait quietly, maybe something good would come along. But no—with men it's rush, rush, rush, every minute. I'm glad I'm a sedentary spider.
译文：喝醉后控制不住情绪胡言乱语，醒来后就会后悔，健康的时候不注意调养生息，等到生病的时候就会后悔。赏析：物极必反，做任何事都要有个尺度，同时要做到防患于未然，否则就会发生祸患。
Every discovery raises new questions.