outwardly gentle but inwardly firm; an iron fist in a velvet glove
她虽然表面上总是轻声细语，但处理问题时却刚中柔外，从不轻易动摇。
Although she always speaks softly on the surface, she is outwardly gentle but inwardly firm when handling problems, never wavering easily.
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outwardly gentle but inwardly firm; an iron fist in a velvet glove