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The structure 不⋯⋯不⋯⋯ is a common grammatical pattern in Chinese that expresses a negative correlation or contrast between two actions or states. It can be translated as "not... not..." in English, and it often emphasizes the idea that one action or state is contingent upon another not occurring.
Usage: This structure is typically used to highlight a relationship where the occurrence of one action is dependent on the non-occurrence of another. It can convey a sense of inevitability or a strong contrast.
Examples:
你们两个人可真是不打不成交。 (You two really won't reach an agreement without fighting.)
Here, the phrase emphasizes that fighting is a prerequisite for reaching an agreement.
这里的房价不问不知道，一问吓一跳。 (You won't know the housing prices here until you ask, and when you do, you'll be shocked.)
This example illustrates that without asking, one remains unaware of the shocking prices, highlighting the contrast between knowledge and ignorance.
她今天一直在练习，不达标准不休息。 (She has been practicing all day; she won't rest until she meets the standard.)
This sentence shows that her rest is contingent upon meeting a certain standard, emphasizing her determination.
In summary, 不⋯⋯不⋯⋯ is a versatile structure that can effectively convey conditional relationships and contrasts in Chinese sentences.