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vacuum tube
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n. 〈美〉
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concretionary, concretise, concretism, concretist, concretive, concretively, concretization, concretize, concretor, concubinage,
相似单词
vacuum chamber, vacuum cleaner, vacuum flask, vacuum gauge, vacuum pump, vacuum tube, vacuum-assisted, vacuum-baking, vacuum-bottle, vacuum-clean,
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