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单词
radon
释义
radon
r
eɪ
dɒn
ˈreɪˌdɑn
N-UNCOUNT
氡
Radon
is a radioactive element in the form of a gas.
氡
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guanos
guarantee
guaranteed
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guard-dog
guard dog
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更新时间:2025/8/21 20:16:55