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be as hard as nails

（指身体）强状的；结实的；（指心）冷酷的

1、冷酷的

冷酷的 be as hard as nails; coldblooded; flinty; grim; hardhearted; harsh; marbly; me ..

2、结实的

结实的(be as hard as nails), 此释义来源于网络辞典。

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