Build each other up = 彼此提拔

雖然這世界充滿了自私的人，大家還是可以互相幫助，彼此提拔，讓社會變得更好!

「彼此提拔」的其他說法為:

One good turn deserves another.

One hand washes the other.

You scratch my back, and I'll scratch yours.

http://www.chtoen.com/%E4%BA%92%E7%9B%B8%E5%B9%AB%E5%8A%A9%E7%9A%84%E8%8B%B1%E6%96%87%E6%80%8E%E9%BA%BC%E8%AA%AA

-圖片來自LINE每日英文