| 1. | Travel to the planetary systems of other stars is a much more formidable undertaking .
要航行到其他恒星的行星系中去是件极难实现的事。 |
| 2. | Finding planets orbiting barnards star would increase our confidence that planetary systems are common .
对环绕巴纳德里旋转的行星的发现将会增强我们认为行星系是普遍存在的信念。 |
| 3. | If one-third of the stars are single stars with planets, then planetary systems are born, on the average, every three years .
如果这些恒星中有三分之一是拥有行星的单星，那么平均每三年就会诞生一个行星系。 |
| 4. | Proto - planetary system
原行星系 |
| 5. | Astronomers today announced the discovery of another planet orbiting a distant star , making it the most crowded planetary system outside our own
宇航员们今天宣布了又发现了一颗遥远恒星的行星，使之成为我们太阳系以外最密集的行星系。 |
| 6. | In order to obtain dynamic characteristics of transplanting mechanism with elliptic planetary gears of high - speed rice transplanter , a test bed to measure dynamic parameters for high - speed transplanting mechanism is developed
摘要为了得到高速插秧机椭圆齿轮行星系分插机构的动力学特性，研制了高速分插机构动力学试验台。 |
| 7. | 3 ) kinematics characteristics of transplanting mechanism with planetary elliptic gears were analyzed , and its mathematical models were established , which were verified by high - speed video tape recorder
3 )对椭圆齿轮行星系分插机构进行运动学分析，建立数学模型，开发了辅助分析软件，并通过高速摄像验证所建立的数学模型的正确性。 |
| 8. | We must probably discard the at one time widely accept view that if once life had come into the universe in any way whatever , it would rapidly spread from planet to planet and from one planetary system to another until the whole universe teemed with life
我们必须抛弃这样一个曾经广泛流传的观点，那就是，一旦生命以任何形式存在于星际中时，他将从一个行星系蔓延到另一个行星系直至整个宇宙都充满生命为止。 |
| 9. | 2 ) some rules and approaches for kinematics and dynamics analysis of transplanting mechanism with planetary elliptic gears were brought forward . following these rules and approaches , the mechanism analysis working would be simplified and some errors would be avoided
2 )提出了对椭圆齿轮行星系分插机构这种复杂机构进行运动学和动力学分析必须遵循的一些规则和方法，使复杂问题得以简化，避免出现各种错误。 |
