- be as hard as nails
- 指: finger
- 心: the heart
- 冷酷: unfeeling; callous; grim
- 的: 4次方是 The fourth power of 2 i ...
- 冷酷的: be as hard as nails; coldblooded; flinty; grim; hardhearted; harsh; marbly; mephistophelean; mephistophelian; metallic; pitiless; relentless; remorseless; rocky; ruthless; stony; unrelenting
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