Like water splashed on a stone, making no impression; to fall on deaf ears; to have no effect or impact.
他苦口婆心地劝说，希望她能回心转意，但一切努力都如水投石，她根本不为所动。
He earnestly tried to persuade her, hoping she would change her mind, but all efforts were like water poured onto stone; she remained completely unmoved.
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