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单词
radon
释义
radon
ra
don
/
ˈreɪdɑn
/
noun
[uncountable]
(
symbol
Rn
)
Etymology
ETYMOLOGY
radon
Origin:
1900-2000
radium
science
,
chemistry
a
radioactive
gas that is an
element
and that can be dangerous in large amounts
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Valentine's Day
valerian
valet
valet parking
Valhalla
valiant
valid
validate
validated parking
validation
validity
valise
Valium
Valkyrie
Valletta
valley
Valley Forge
Valois
valor
valorous
valuable
valuables
valuation
value
value-added
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更新时间:2025/9/17 21:36:11