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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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protist
protium
proto-
protocol
protomartyr
proton
protonotary
protopectin
protophyte
protoplasm
protoplast
prototherian
prototype
protozoan
protract
protractile
protraction
protractor
protrude
protrusile
protuberant
proud
Prov.
prove
provenance
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更新时间:2025/11/12 18:16:41