氡和钍射气的子体易被气溶胶吸附.The daughter nuclides of radon and thoron tend to become attached.锕射气氡的一种放射性的, 惰性的和气态的同位素, 其半衰期为3.A radioactive, inert, gaseous isotope of radon, with a half - life of 3.92 seconds....
The rescuers were beaten back by strong winds and currents...救援人员因风浪太大而被迫中断工作。The rescuers were beaten back by strong winds and currents.救援人员因风浪太大而被迫中断工作。The water above the continental shelf is moved by the tides and by...
"You were just looking," contends Samantha. "I was the one doing all the work."“你不过是看看而已。”萨曼莎争辩道，“什么活儿都是我来干。”Listen. Samantha is having a driving lesson.听一听. 萨曼塔在上驾驶课.Samantha, you must change gears.萨曼塔, 你要换档....
Wholesalers , retails , order by contract, salesmen and other kinds of trade ways.批发 、 零售和合同订货等多种贸易形式.Wholesalers reported an improvement in sales for the third quarter.批发商宣布第三季度的销售额有所提高.We retail to the general public a...