请输入您要查询的英文单词：
单词
hard nut to crack
释义
hard nut to crack
in American English
or
tough nut to crack
a person, problem, or thing difficult to understand or deal with
See full dictionary entry for
nut
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leucomata
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leucoplakic
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leucoplastid
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leucopoietic
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更新时间：2025/3/12 0:00:45