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Meaning of 半瓶水响叮当

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bàn píng shuǐ xiǎng dīng dāng (Trad.: 半瓶水響叮噹)
lit. if you tap a half-empty bottle it makes a sound (idiom); fig. empty vessels make the most noise; one who has a little knowledge likes to show off, but one who is truly knowledgeable is modest