词汇 | radioactive |
词根词缀 | 词源: 1898, from Fr. radio-actif, coined by Pierre and Marie Curie from radio-, comb. form of L. radius (see radiation) + actif (fem. active) "active." 词根记忆: a. 放射性,放射引起的The radiation radius of the radioactive radium radiator in the stadium is variable.放射性的镭暖气装置的辐射半径在体育场是易变的. |
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