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Meaning of 一瓶子不响,半瓶子晃荡

Lookup via: Pinyin | Radicals
píng zi xiǎng , bàn píng zi huàng dang (Trad.: 一瓶子不響,半瓶子晃蕩)
lit. a full bottle makes no sound; a half-filled bottle sloshes (idiom); fig. empty vessels make the most noise