运用转换翻译法翻译下列句子: 1. The shadow cast by an object is long or short according as the sun is high up in the heaven or near the horizon. 2. How rapidly a fuel burns depends on how thoroughly it is mixed with oxygen or air. 3. Variation is common to all plants whether they reproduce asexually or sexually. 4. Quasi-stars were discovered in 1963 as a result of an effort to overcome the shortcomings of radio telescopes. 5. From this experiment the conclusion is drawn that the theory of oppositely charged particles attracting each other is true. 6. Using a person’s voice as an identifier is based on the fact that the geometry of the vocal tract differ greatly from person to person. 7. As most metals are malleable and ductile, they can be beaten into plates and drawn into wire. 8. Manuel fire alarm stations are installed on each floor at the stairs to be used for fire notification by the building occupants. 9. It is a set of programs governing the way in which multimedia files are created and displayed on the internet. 10. In the atmosphere, the ratio by weight of the nitrogen and oxygen varies slightly about an average of 3.2 : 1.