There are not many persons who pretend to an exact knowledge of the subject.

自认对那个题目有确切了解的人不多。

youdao

Pope had an exact knowledge of all that he himself loved or hated, loathed or wanted.

蒲伯对他自已热爱或憎恨，嫌恶或需要的一切都有准确的理解。

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Until we accumulate enough exact knowledge, any practice is in vain and is bound to fail.

在我们积累了足够的准确知识前，任何实际操作都是徒劳无功的，注定会失败。

youdao

It resides in the specific and exact knowledge of those people who actually do whatever it is.

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Tying that knowledge to the exact genetic sequence will be a big step forward.

ECONOMIST: Fruit-fly genetics: Shotgun success | The

This involves searching for close, though not exact, matches in the DNA database, in the knowledge that such hits could represent family members of a suspect.

BBC: DNA crime-fighting in UK 'lagging behind', experts say