Courtesy costs nothing. Lower the toilet seat after use. Let the people in the elevator exit before you enter. Return shopping carts to their designated areas. When you borrow something， return it better shape (filled up， cleaned) than when you got it.

如果你无法飞翔，那就奔跑；如果你无法奔跑，那就快走；如果你无法快走，那就爬行。但无论如何，你必须继续前进。

Precision agriculture isn't about replacing farmers—it's about empowering them with better tools.

如果我们想要清洁的空气和水，就必须从保护森林开始。