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单词
radon-222
释义
radon-222
radon-222
[
′rā‚dän ‚tü′twen·tē‚tü
]
(nuclear physics)
The isotope of radon having mass number 222, symbol
222
Rn, which is a radioactive member of the uranium series with a half-life of 3.82 days.
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on the track
on the track of
on the track of doing
on the track of seeking
on the track of someone
on the track of someone or something
on the trail
on the trail of
on the trail of (someone or something)
on the trot
on the turn
on the understanding that...
on the up
on the up and up
on the up-and-up
on the upgrade
on the up side
on the up-side
on the upside
on the upswing
on the uptake
on the verge
on the verge of
on the verge of at the very beginning of doing
on the verge of doing something
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更新时间：2026/9/8 1:53:04