Have certain knowledge of parenting and advanced education concept.

有一定的育儿知识和先进的教育理念。

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He claims to have a certain kind of knowledge of what justice is, and claims to be able to teach it to others.

他声称拥有,某种解释正义的知识，并声称自己能向他人传授这种知识。

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But I wrote it because I have a certain amount of knowledge about the subject.

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But if you are a Wharton professor, it is a pretty certain bet that you have a great deal of knowledge that is not shared by the general public.

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But they do need a certain level of knowledge and skill in order to have a proper appreciation of the technical and psychological issues facing the person they are mentoring.

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