每日商務英語 第645期:鐵石心腸

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hard as nails ----------- 鐵石心腸（成語）

英文釋義
(IDIOM) Unyielding; lacking compassion; unsympathetic.

例句
The wealthy old woman was as hard as nails, and never gave help of any kind to her friends or family members if they were experiencing difficulties.
這位有錢的老婦人是鐵石心腸，在朋友或家人有困難時從不給他們任何形式的幫助。