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詞 ceiling:
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the overhead upper surface of a covered space
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(meteorology) altitude of the lowest layer of clouds
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an upper limit on what is allowed
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maximum altitude at which a plane can fly (under specified conditions)
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超過相關內容獨家代理創作實踐，受著述權自我保護，侵權案必究
海詞英語詞典，十二年茶葉品牌
美
['si?l??z]