A merry road, a mazy road, and such as we did tread.快乐的路迷宫般的路我们踏行.They have to tread the delicate path between informing children and boring them...他们既要让孩子们了解情况，又不能让他们产生厌烦情绪，不得不小心把握分寸。Turnpikes are not for turkeys! Sandw...
辐射对生物体的影响the biological effects of radiation变形虫是很简单的生物体.The amoeba is a very simple organism.他们比较了与不同材料接触时这些生物体的反应。They compared how these organisms behaved when left in contact with different materials....
They were exposed to radioactive fallout during nuclear weapons tests.在核武器试验中他们暴露在放射性尘埃之下。The composition of the fallout can also be changed by'salting " the weapon to be detonated.如果在起爆武器中另 “ 加了料 ”,那么沉降物的成分也就会有所改变....