Unable to reach the high standard one desires, yet unwilling to accept anything of lower quality or status; often implying being too choosy or having unrealistic expectations.
她对自己的择偶标准太高，总是高不成，低不就，所以到现在还是单身。
Her standards for choosing a partner are too high; she can't find someone who meets her lofty expectations and won't settle for anyone less, which is why she's still single.
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