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radio-astronomer
radio-
radio transmitter
radio telescope
radio frequency
radio-carbon
radio-controlled
radio-frequency
radio-therapist
radio-therapy
radioactive
radioactivity
radiogram
radiograph
radiographer
radiography
radioisotope
radiologist
radiology
radish
radium
radius
radon
RAF
raffia
raffish
raffishly
raffishness
raffle
raft
rafter
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radio-carbon
/ 9redIEU 5kB:bEn; 9redIo`kBrbEn/
n [U] radioactive form of carbon present in organic materials, used in carbon dating 放射性碳（有机材料中碳元素的放射性形式, 用以测定某物的年代）.
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