a hard nut to crack

a hard nut to crack是什么意思、a hard nut to crack怎么读
棘手的问题

a hard nut to crack汉语翻译

棘手的问题
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a hard row to hoe
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skull cracker
skin crack
shrinkage crack
non-coking thermal cracking
Knox cracking
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Jenkine cracking
crack back
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