fission level 裂变能级
level fission
级裂变
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Xenon-133 is a radioactive noble gas produced during nuclear fission that poses no concern at the detected level.
FORBES: EPA Sounds an 'All-Clear' (so far) for Western U.S.
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