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| 21. | A light-year is the distance light travels in one year at a speed of 299,792 kilometers per second. |
| 一光年是光以每秒299792公里的速度在一年中所走过的距离。 |
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| 22. | An axial self tightening V belt driving device has been developed and used in a high speed single cylinder |
| 作者开发了一种轴向自动张紧式三角带传动装置,并把它应用于转矩脉动强烈,高频冲击性的高速单缸LPG发动机试验台上。 |
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| 23. | There are these twins, and one takes a journey in a spacecraft at the speed of light |
| 有对双胞胎,其中一个 乘坐太空船以光速飞行 |
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| 24. | design of the M,H provides low-stress, horizontal motion by two, independent pairs of squaring jaws; all in |
| MPI贴装头的设计提供了两对互不制约的中心夹以独立、高速的动作进行低压力，水平地运动。 |
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| 25. | A small cylindrical shaft used to drive magnetic tape at a constant speed in a tape recorder. |
| 主动轮指小型圆筒状的驱动轴，用于在录音机中驱动磁带使之恒速转动 |
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| 26. | Light travels in space at a speed of about 300000 kilometers per second, and this figure has been proved |
| 光在空间约以每秒30万公里的速度传播，这一数值已被用多种不同方法证明是正确的。 |
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| 27. | What we introduce here are cars of future models, elegant in appearance and with a speed unparalleled |
| 这里介绍的是外形高雅，具有与以往无与伦比的速度的未来型汽车。 |
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| 28. | "In a recent experiment,the speed 0f a shuttle cock after being smashed Call reach 261 kilometres an |
| 在最近的一次实验中,羽毛球在被扣球时时速可达每小时261公里。 |
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| 29. | a control device that maintains a steady speed in a machine (as by controlling the supply of fuel). |
| 在机器中保持稳定速度的控制装置。 |
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| 30. | In sound recording, a low frequency noise usually produced by regular variations in the speed of a system's |
| 录音技术中的一种低频噪声，通常由于系统机械部件的速度有规律变化而引起。 |
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