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- Uranium is radioactive. 铀具有放射性。
- Uranium is a lithophile element. 铀是亲石元素。
- The energy signature used is radioactive. 被用的能量信号是放射性的。
- Uranium is used to fuel nuclear plants. 铀用作核电厂的燃料。
- Uranium is abundant in some parts of the world. 铀在世界上某些地方的蕴藏量十分丰富。
- Unearthing more uranium is expensive and time-consuming. 发掘更多的铀矿成本昂贵而且耗费时间。
- Uranium is just one of several hazards in postwar Iraq. 战后的伊拉克境内,铀只是诸多危害物中的冰山一角。
- Uranium is very valuable because it is a rare element. 铀很贵重,因为它是稀有元素。
- But this isotope is radioactive and decays about six times faster than does uranium 238, which indicates that the fissile fraction was much higher in the distant past. 但是,铀235是具放射性的,而且衰变的速度比铀238快六倍,表示在古代,这个易分裂同位素的比率,比现在高得多。
- The concept holds that uranium is leached by groundwater from tuffeceous rocks. 该理论认为, 来自凝灰岩的地下水淋蚀铀。
- Widespread as the occurrence of uranium is, the ores are mostly very low-grade. 铀矿藏尽管分布很广,但矿石却大多是低品位的。
- Detection of uranium is needed to determine the accurate age of this star. 检测铀则需要准确判定年龄这颗恒星.
- Tritium is radioactive and is believed to be the main source of the major traces of 3He found in the atmosphere. 氚是放射性的,并且确信是大气中痕量3He的主要来源。
- Some of the carbon dioxide absorbed by plants during photosynthesis is radioactive. 植物在光合作用中吸收的一些二氧化碳具有放射性。
- Radium and uranium are radioactive elements. 镭和铀是放射性元素。
- Usually steel plants, paper mills, shipbuilding, agriculture branch is not used in the test is radioactive rays. 通常钢铁厂、造纸厂、造船厂、农科所中所用的无损检验中的射线就是放射性的。
- Radioactive ray is material thing. 放射线是实际的物质。
- One of the methods to set free the energy locked in such substances as uranium is known as nuclear fission. 一种把储存在象铀这样的物质里面的能量释放出来的方法被称为核裂变。
- There is a vein of melancholy in his character. 他的性格中有少许忧郁的气质。
- There is positive proof that he did it. 有确切的证据证明他做了此事。