Outwardly strong but inwardly weak; appearing formidable or impressive but actually lacking substance or courage; an ass in a lion's skin.
他虽然平时说话很大声，但遇到真正的问题时却总是退缩，真是虎皮羊质
Although he usually speaks loudly, he always retreats when faced with real problems; he truly has a tiger's skin but a sheep's nature.
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