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jù shā chéng tǎ ㄐㄩˋ ㄕㄚ ㄔㄥˊ ㄊㄚˇ

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Từ điển Trung-Anh

(1) sand grains accumulate to make a tower a tower (idiom); by gathering small amounts one gets a huge quantity
(2) many a mickle makes a muckle