sealed, (adjective): completely closed so that nothing can get in or out. Example sentence: The food was kept in a _____ container to keep it fresh. Mandarin: 密封的, ventilation, (noun): the movement of fresh air into and out of a place. Example sentence: Good _____ helps keep a room cool and healthy. Mandarin: 通风., generator, (noun): a machine that produces electricity. Example sentence: The _____ supplied power when the lights went out. Mandarin: 发电机, external, (adjective): on the outside of something, not inside. Example sentence: The _____ wall of the building was painted white. Mandarin: 外部的；外面的., civilisation, (noun): a society with organised government, culture, and cities. Example sentence: Ancient Egyptian _____ built impressive pyramids. Mandarin: 文明, socket, (noun): a place where you plug in an electrical device. Example sentence: She plugged the charger into the wall _____. Mandarin: 插座；插口

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