First rule of a real world: not everyone around you is your friend.

First rule of a real world: not everyone around you is your friend.
真實世界的首要規則: 不是你身邊的每一個人都是朋友

句子單字學習
rule：規則；法則；規章；條例
world：地球，世界
around：四處，周圍；圍繞
friend：朋友