radioactivity
美音:
[´reıdıəuæk´tıvətı
]英音:
[´reıdıəuæk´tıvətı
]n.放射能
难易程度:
radioactivity为短语/超纲词汇
词根
radi=ray(光线)
radioactivity
/,reɪdɪəʊæk'tɪvətɪ; `redɪ,oæk`tɪvətɪ/
n [U].
radioactivity
n[U]the sending out of
radiation (=a form of energy) when the
nucleus (=central part) of an atom has broken apart
the discovery of radioactivity high levels of radioactivity
1. Some rare metals have radioactivity. 某些稀有金属具有放射性。
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