健康的动物是健康食品链的基础。
It is wrong to have an ideal view of the world. That's where the mischief starts. That's where everything starts unravelling.
可持续发展的关键是平衡经济增长和环境保护。
生活就是要冒险,如果你不冒险,你永远不会知道自己能做什么。