人心在任何年龄都只会向同样敞开的心敞开。

We must mine coal responsibly today so that our children inherit both energy security and a healthy environment.

Good science requires both creativity and discipline.

乌鸦聚集在一起，虽然看上去很和好，实际上并不亲密；不慎重地结交朋友，虽似牢固，终必破裂。