Of course, an uninformed recommender is just a degenerate case and may still be useful.
当然，一个信息不足的推荐系统只是一个比较不理想的情况但可能仍然是有用的。
In degenerate case, stationary perturbation theory becomes to a move complicated problem.
在简并情况下，定态微扰理论变成一个比较复杂的问题。
This new protocol should be a todo list protocol, not a messaging protocol, although there is a degenerate case where what someone wants you to do is: read the following text.
邮件更像是一个消息传递器：可能某些人需要你做的事情只是阅读这封邮件而已。
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