21.The attempt to develop atomic energy will undoubtedly revolutionize the lives of the coming generation.
21.开发原子能的尝试必将使未来人类的生活发生革命性的变化。
22.The only resource of petroleum products is crude oil, which is pumped up from the interior of the earth.
22.原油由地下抽出，它是石油产品的唯一原料。
23.Alcohol molecule is composed of carbon, hydrogen and oxygen.
23.酒精分子式由碳、氢、氧三种元素构成。
24.After analyzing the ancient housing estate, the historical expert reached a conclusion that the Indians were the original inhabitants in North America.
24.经过对古代住宅区的分析，历史学家得出一个结论：印第安人是北美地区最早的居民。
25.Most of the telecommunication networks are accurately controlled by electronic robots.
25.大多数远程通讯网络由电子自动装置精确地控制。
26.You should read the handy booklet for reference before commencing using the delicate scale.
26.在用这台精密天平之前，你应该读一下那参考手册。
27.Some species of bacteria and virus thrive in simple compounds such as alcohol.
27.一些细菌和病毒活跃于简单的化合物诸如酒精中。
28.Laser light beaming onto glass fibers casts a characteristic pattern.
28.射在玻璃纤维上的激光放射出一种特有的图像。
29.Through the microscope lens I can clearly observe the worm egg that is not apparent to the naked eye.
29.透过显微镜片，我清楚地看到了肉眼无法看到的蠕虫卵。
30.He is amazed that through triangle mirror, the torch light’s reflection spectrum turns to a colorful ribbon image.
30.令他感到惊奇的是：通过三棱镜的反射后，手电光的反射光谱变成了多彩的带状图像。