| 1. | They are employed in several photometric procedures .
它们在几种光度法中获得作用。 |
| 2. | Less critical is the situation in the case of photometric observation .
做光度测量的条件就不那么严格了。 |
| 3. | The knowledge of this quantity is of importance for photometric measurements .
这个量对于光度测量是很重要的。 |
| 4. | Illuminance of illuminating radiation is always measured in photometric units .
照明辐射的照度通常是以光度为单位。 |
| 5. | Atomic absorption spectrophotometry is a relatively new method of analysis .
原子吸收分光光度法是一种比较新的分析方法。 |
| 6. | The cloud should then have an infrared luminosity thousands of times the sun's bolometric luminosity .
云的红外光度应为太阳热光度的几千倍。 |
| 7. | Each line must contain several hundred individually identifiable halftone light values .
每一条线必须包括几百个各自认得出的用网屏表示的光度值。 |
| 8. | Astronomers tacitly assume that stars of the same luminosity and color all have the same mass .
天文学家心照不宣地默认，光度和颜色都相同的恒星具有相同的质量。 |
| 9. | As soon as the contracting cloud becomes opaque to its own infrared radiation, its luminosity will drop abruptly .
一旦收缩云变得对它的红外辐射不透明时，它的光度便要急剧地降低。 |
| 10. | Paradoxical as it may seem, the value of a star's luminosity does not depend on the nuclear reactions taking place in the interior .
看来十分奇怪的是，恒星的光度竟然与发生在内部的核反应无关。 |
