I was struck by the fact that the activity of uranium and thorium compounds appears to be an atomic property of the element uranium and of the element thorium.是什么意思_I was struck by the fact that the activity of uranium and thorium compounds appears to be an atomic property of the element uranium and of the element thorium.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句