Efficiency and environmental responsibility can—and must—go hand in hand.
唱歌不是为了拿奖,是为了感动人。
No man's knowledge here can go beyond his experience.
如果你不固执,就会过早放弃试验。如果你不灵活,就会头撞南墙,而无法另辟蹊径解决当下难题。