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单词
radon
释义
radon
n. Chem. a gaseous radioactive inert element arising from the disintegration of radium, and used in radiotherapy.
Usage
Symb.: Rn.
Etymology
: RADIUM after argon etc.
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archway
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arcus senilis
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ardent
ardour
arduous
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area
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更新时间:2025/11/13 20:27:36