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- speed of cosmic expansion 宇宙膨胀速度
- The constant hailstorm of cosmic rays is not the only radiation threat, of course.The sun, too, can unleash tremendous bursts of protons and heavier nuclei traveling at nearly the speed of light. 当然，遍布太空的宇宙射线风暴并不是唯一的威胁，太阳也会释放大量质子与重原子核，以接近光速喷出。
- The speed of this aircraft is very high. 这架飞机的速度非常快。
- The hurricane has a speed of 73 miles per hour. 飓风每小时73英里。
- The speed of a runaway horse count for nothing. 脱缰之马的速度毫无价值。
- Planets were formed out of cosmic dust. 行星是由宇宙尘形成的。
- The speed of light is an important constant. 光速是一个重要的常数。
- The speed of the toy boat is variable. 玩具船的速度是可变的。
- The symbol for the speed of light in a vacuum. 表示真空中光速的物理符号
- Rapidity or speed of motion; swiftness. 迅速，快速运动的快速或速度; 迅速
- Cosmic expansion had diluted the density of the gas to the point where collisions were too infrequent to equalize the spin and kinetic temperatures. 宇宙膨胀至此，已将气体稀释到一定的程度，使得原子碰撞不再频繁地让自旋与动力温度相等。
- When did the first measurement of the speed of sound take? 第一次测量声速是在什么时候？
- Cosmic expansion has got its groove back: once thought to be winding down, it is actually speeding up. 宇宙膨胀也因此重获律动：当你认为它应该变慢时，实际上却变快了。
- Raindrop fall at a speed of about500 to1,000 feet a minute. 雨点以每分钟大约五百到一千英尺的速度下降。
- And if the dark energy is not vacuum energy at all, then its future impact on cosmic expansion is uncertain. 如果暗能量全然不是真空能量，那麽它未来对于宇宙膨胀的影响就不能确定。
- Early in cosmic history, three of them partook in the cosmic expansion and became the three dimensions we now observe. 在宇宙历史的早期，其中的三维参与了宇宙膨胀，而变成了我们今天看到的三个空间维度。
- Therefore, the irreducible warp of the brane acts like a cosmological constant, which speeds up cosmic expansion. 因此，这膜上无法消除的时空弯曲就表现的如同宇宙常数，导致了宇宙的加速膨胀。
- Airliners in service at present cannot fly faster than the speed of sound. 目前供使用的客运机飞行速度不能超过音速。
- Like Darwinian evolution, cosmic expansion provides the context within which simple structures form and develop over time into complex structures. 宇宙的膨胀就像达尔文的演化论，对于简单的结构如何逐步发展形成复杂的结构，提供了可循的脉络。
- Mach two equals twice the speed of sound. 二马赫相当于声速的二倍。
