| 词汇 | a hard nut to crack造句 |
| 释义 | a hard nut to crack造句1、Employee turnover is a hard nut to crack for human resource management. 2、Sometimes, it is a hard nut to crack without an expert's help. 3、A hard nut to crack and find! a hard nut to crack翻译棘手的问题 |
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