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khoảng + 
about, approximately 
khoang ☊ khoảng ☊ khoáng ☊ khoắng ☊ like: Khoảng
hold (of a ship, airplane, boat) ☊ khoang ☊ mineral ☊ khoáng ☊ approximately, around; distance ☊ khoảng ☊