What are the criteria for a beneficial friend?

那益友的标准又是什么呢？

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Nevertheless, a humorous friend is also beneficial to us.

然而，一个幽默的朋友对我们也是有益的。

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If, on the other hand, the ex-follower isn't a friend, you have an exchange relationship: a mutually beneficial trade in links, information, and follower counts.

另一方面，如果前跟随者不是朋友，你们就是交换关系；一个互相有利的交易关系，体现在连接，信息和跟随者点击数上。

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However a teacher friend told us it was nonsense as in her view it was far more beneficial for the child to have a holiday than be in school providing it was not before the end of term exams.

BBC: NEWS | UK | Education | Girl expelled over term holiday

Over time, the babies' immune systems start to distinguish between friend and foe in the microbial world, and launch attacks on potentially harmful bugs while leaving beneficial ones, like those that live in the gut, alone.

CNN: Connection between dirty diapers, childhood health