Satellites orbiting round the earth have provided scientists with a vast amount of information about conditions in outer space . 环绕地球运行的人造卫星，为科学家提供了有关外层空间的大量资料。
Satellites orbiting round the earth have provided scientists with a vast amount of information about conditions in outer space . 环绕地球运行的人造卫星为科学家们提供了大量有关外层空间情况的资料。
Recent trends have been towards the construction of progressively larger plants to increase savings in both capital and operating cost . 当前的趋势是建造规模不断增大的工厂以更多地节省基建费和运行费。
Operating and maintenance personnel must be adequately protected from the electrical hazards associated with open electric elements . 运行和保养人员必须对裸线式电热元件的电气危险性，有相应的防护措施。
The light tonguelike streaks indicate distances the reflective flakes traveled during the exposure time of the photograph, 1/30 second . 亮的舌状条纹表示反光薄片在曝光的一刹那间（130秒）所运行的距离。
The time lag can be envisioned as the time required for the liquid propellants to travel from the injector to an effective combustion "front. " 可以把迟滞想象为液体推进剂从喷注器运行到有效燃烧“锋”所需的时间。
The earth in moving around the sun, would impinge on move particles which are coming from its forward side than from its hind side . 地球绕太阳运行时，它与从前面射来的粒子相碰撞的次数，将比从后面射来的粒子要多。
The pictures radioed back by spacecraft that have orbited and landed on mars show a host of intriguing geologic structures . 从围绕火星运行和在火星上着陆的宇宙飞船所传回来的照片上，可以看到一大批令人感兴趣的地质结构。
Finally, when in orbit round the earth, the calculators calculate exactly when to fire the retro-rocket to effect re-entry . 最后，在围绕地球的轨道运行的时候，计算机会精确地计算出应该在什么时候发射制动火箭以重返大气层。
