| 1. | The sun had already climbed to its zenith .
太阳已经升到当空。 |
| 2. | A bright moon is shining in the sky .
一轮明月当空照。 |
| 3. | The drag force decreases as the air density decreases .
当空气密度减小时阻力也减小。 |
| 4. | When air is moving, the metal is pivoted on the hinge .
当空气流动时，金属板在铰链上转动。 |
| 5. | A bright moon hung in the sky .
皎月当空。 |
| 6. | These effects appeared to be reversible when air quality improved .
当空气质量改善时，这种效应是可以消除的。 |
| 7. | As the air proceeds along the test section the boundary layer thickens .
当空气沿着试验段流动时附面层逐渐变厚。 |
| 8. | When air is heated, it expands and when air is cooled, it contracts .
当空气被加热时，它就膨胀；当空气变冷时，它就收缩。 |
| 9. | An appreciable reduction in oxygen content will lead to discomfort and possible death .
当空气中的氧含量明显下降时，人会窒息甚至可能死亡。 |
| 10. | It was like garish noon rising to the dignity of sunset in a couple of seconds .
那好象晶明当空的午日，在几秒钟之内变成灿烂庄严的夕阳一般。 |
