"Parental investment is the key to understanding the origins of sex differences."

When we love, we always strive to become better than we are. 

第一步是确定某事是可能的；然后概率就会发生。

The mining industry must lead in demonstrating how extractive operations can coexist with environmental stewardship.

【大意】干枯的竹子能生火，但不去钻它就不会燃烧；地下藏有泉源，但不去挖掘就流不出泉水来。