大量的时间，它的，不值得学习，就可以成为危险。
Amount of time, it's not worthwhile to learn and can become dangerous.
然而一些研究显示，自我关心是一个可以学习的技能，甚至对于那些特别认为自己不值得学的人也如此。
But some research shows that self-care is a skill that can be learned, even for people who specifically don't feel they deserve to learn it.
需要提供多大程度的服务——哪里是底线——是经营者们从学习探索中得出的经验，聪明的企业家会发现在某些客户身上根本不值得浪费精力。
How much service to provide — and where to draw the line — is a learning experience for entrepreneurs, and smart ones realize there are customers who aren't worth the trouble.
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