| 1. | Quakewatchers in california are uneasy .
加利福尼亚的地震观测者焦虑不安。 |
| 2. | Experienced observers concentrate on systematic investigations .
有经验的观测者致力于系统的研究。 |
| 3. | The technique of the drawing depends on the ability of the observer .
绘图技术取决于观测者的能力。 |
| 4. | The observer should always make full notes about the atmospheric conditions .
观测者要对大气条件作详细记录。 |
| 5. | Of particular importance to the observer is the position of the terminator .
对于观测者特别重要的是明暗界线的位置。 |
| 6. | Every observer in a satellite program is in a way a pioneer of space travel .
卫星计划的每一个观测者，都可以说是宇宙旅行的先锋。 |
| 7. | An observer moving with the spaceship measures the speed of the light and obtains the value c .
在宇宙飞船上的一个观测者，测得光速为C。 |
| 8. | Indispensable for the observer is a good star atlas, containing all naked eye stars .
观测者必须具备一份包括肉眼能看到的所有天体的好星图。 |
| 9. | To follow these movements of sunspots is worthwhile for every solar observer .
任何一个太阳观测者值得花时间和精力去跟踪观测太阳黑子的这种移动。 |
| 10. | To prevent damage, the observer will choose a friction clamp or better still an adjustable clamping ring .
为防止损坏，观测者应采用摩擦夹紧方式，用可调夹圈更好。 |
