hoary [ˈhɔ:ri]

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adj.古老的；鬓发斑白的

very old and familiar and therefore not interesting or funny

They discussed the hoary old problem. 他们讨论老问题。
Without a word spoken, he hurried away, with his hoary head bending low. 他什么也没说，低着白发苍苍的头, 匆匆地走了。