专家并非万事皆通，而是知其不知，懂得独善其身。
Experts don't know everything, but they know what they don't know and where they need to improve.
这些人的知识虽然有缺陷，有不足之处，可是知其不知的真诚救了他们，因此他们也算得上是饱学之士了。
You may say that they are learned scholar though their knowledge is defective; however, their awareness of ignorance makes up for it.
我只见过那位老板一次，所以我只知其人。不知其脾气。
I saw that boss once, so I only and had no knowledge about his temper.
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