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HSK levels

    半瓶水响叮当 半瓶水響叮噹

    bànpíngshuǐxiǎngdīngdāng

    1. 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