The Minnesota work on kaersutite also showed the presence of the isotope neon - 21.明尼苏达大学关于钛角闪石的研究表明,其中也存在同位素氖 - 21.Today, most cyclotrons are used either for instructional purpose or for isotope production.今天大多数回旋加速器是用在...
某些种类的动植物不能适应迅速变化的环境。Some animal and plant species cannot accommodate to the rapidly changing cond-itions.这个岛屿拥有丰富多样的景致及种类繁多的野生动植物。The island offers such a wide variety of scenery and wildlife.这本书包括了有关动植物的一些有用的知识。The book...
He explained the yellow fever epidemic as a providential act to discourage urban growth.他解释说黄热病的流行恰好减缓了城市的扩张。It'struck her as providential that she should be the instrument of his initiation.在她看来,由她来担任这个启蒙的角色实出天意.Th...