Gift economies exist in primitive cultures where scarcity is not a problem.
礼物经济在物质不匮乏的远古时期就已经存在。
Exist side by side a lot of problem demanding prompt solution.
同时存在许多亟待解决的问题。
Automatic test paper generation is a NP hard problem while restrictions exist.
试题库自动组卷问题是一个NP难题。
Useful if you know a problem doesn't exist in that function.
有用的，如果你知道一个问题，不存在该功能。
We are discussing a problem that should not exist in the first place!
我们在讨论一个本来不是问题的问题。
It was a tactical problem, today it won't exist anymore.
那是战术上的矛盾，今天已经不存在了。
It was a tactical problem, today it won't exist anymore.
那是战术上的矛盾，今天已经不存在了。
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