Laughter and tears are both responses to frustration and exhaustion. I myself prefer to laugh, since there is less cleaning up to do afterward.

Nature is the greatest artist.

行为的目标总是某种驱力或需求的减少。

Peace is not the absence of war， but a virtue based on strength of character.

交换、交易和互换的倾向普遍存在于所有人之中，而在其他动物种族中找不到。