In particular, the speed of the Moon around the Sun will never be negative, so the Moon will never loop backwards.
特别是月球绕行太阳的速度决不可能是负的，所以月球永远不会向后打转。
It governs the behaviour of subatomic particles zipping around powerful accelerators at close to the speed of light and its equations foresaw the conversion of mass into energy in nuclear bombs.
该理论掌握了亚原子粒子在强大的加速器的作用下可以达到接近光速的速度这一表现行为。相对论的公式也预见了核弹中质(量)能(量)转换的现象。
Last year saw the introduction of a rapid new diagnostic test for TB that is vastly superior in its speed and sensitivity, delivering results in around 100 minutes.
去年引进了一种新的结核病快速诊断检测方法，在速度和灵敏度方面远超过其它检测法，仅需约100 分钟即可提供结果。
In a variation of the game, drivers approach roundabouts at high speed and go around the wrong way.
该游戏还有一个变种，司机们需要以高速在非法的车道上绕行。
Since then the length of the Tour has fallen steadily but the average speed of the winner has risen to around 40km/h.
自那以后环法的比赛路程缓慢下降，但冠军的速度却不断上升，达到每小时40千米。
Eurocopter believes its design could give a helicopter around 50% more speed and range, and not at a huge cost.
欧直公司认为它的设计能够使直升机增加约50%的飞行速度和飞行里程，而且并不用付出多大代价。
With remarkable speed, worries have shifted from inflation, which is still around 5%, to deflation.
以这种速度降下去，人们担心目前还在5%左右的通货膨胀将有可能转变为紧缩。
The speed of the Earth around the Sun is about 30 times the speed of the Moon around the Earth.
地球绕行太阳的速度大约是月球绕地球的30倍。
Uploading this one-megabyte software update takes around an hour, so its speed is comparable to that of a 1990s modem connection.
传送这个1Mb的软件用时要1小时左右，“堪比”20世纪90年代调制解调器的速度。
Timing these over those machines tells me this takes just short of 9 seconds to compile, which is around a sixteen-times speed increase.
通过对这些机器进行计时，我得知编译时间缩短了9秒，速度提高了大约16倍。
Mr Epp reckons that his car should be allowed on urban streets with speed limits of around 50kph (30mph) or less.
艾普先生还认为王朝公司生产的汽车应该允许在限速50kph (30mph)左右的城市街道上行使。
And to make matters worse for the pilot, as the tips of the rotor blades approach the speed of sound (around 1,200kph at lower altitude temperatures), shock waves produce huge vibrations.
这种情况对飞行员来说很糟，因为螺旋桨的尖部接近声速(在海拔较低的温度下大约1200kph)，冲击波造成强烈震动。
Their calculations showed that small waves of air in repeated fast pulses could steer a carpet at a speed of around one foot per second.
他们的计算表明，快速而持续的微小空气波动可以使毯子达到每秒一英尺(译者：30.48厘米)的飞行速度。
They are gathered up and injected into the quantum experiment at speeds of around five meters per second - just a hundredth the speed of the molecules flying around in the air.
它们被聚集起来投入实验，此时速度大约是5米每秒——仅为空气中分子自由碰撞速度的百分之一。
Britons can expect to get an average speed of around 3.8 megabits per second, while those in South Korea, the highest ranked country, enjoy average speeds of around 12 megabits per second.
未来，英国预计平均网速可以达到3.8兆比特每秒（以下按照国内习惯简称X兆宽带）。而南韩，排名第一的国家，人们可以享受平均速率达12M左右的宽带。
The shuttle takes about 1.5 hours to go around and the speed, that tangential speed, is very close to eight kilometers per second.
飞机需要一个半小时,且其切向速度，非常接近8千米每秒。
Put favorite sites on Speed Dial. Stop looking around in your bookmarks.
添加你最喜爱的网站放在首页到快捷访问不再需要从你大量的书签中寻找 帮你解除输入长URL的烦恼。
The bright return stroke travels upward at around half the speed of light, and is too fast to capture in more than one image.
闪亮的回击以光速的一半速度上行传播，由于它的速度太快，在一张图象中不能捕捉到这一过程。
For most of the time, this happens at around the same speed that human fingernails grow - about 16mm a year.
大部分时间里，撕裂发生的速度与人类指甲生长的速度一样——每年大概16毫米。
While speed analysis tools have been around for years, Page speed Online has a neat little trick; it can also analyze mobile websites for their performance.
尽管速度分析工具已经存在好几年了，但此款线网页测速有个不同的地方；它同时能分析手机网页的表现。
We live in an era in which information, goods and capital speed around the globe, every hour of every day.
我们生活在这样一个时代中，信息、货物和资金每时每刻在世界上流动。
But even if they make it to market soon, don't expect to be zipping around the country at the speed of sound.
即使这些飞机很快的投入市场，也不要期待以音速飞行的飞机可以在国家间呼啸而过。
"You could put a cage around it, or an engine, everyone loves speed," he blurts while jumping rope.
“你可以加装个笼子或者引擎。大家都喜欢飙高速。”他一边跳绳一边不假思索地说。
That means that the speed of the Moon around the Sun will vary between about 103% and 97% of the speed of the Earth around the Sun.
这就意味着月球绕行太阳的速度的改变范围是在地球绕行太阳速度的97% ~ 103%范围之间。
A pitch controller rotates each blade around a bearing, setting it to the best angle for the wind speed.
同时间距控制装置会根据风速旋转安装在轴承上的风叶，保持在最佳角度。
This week the IMF predicted that global GDP should expand by 4.8% this year—slower than in the boom before the financial crisis, but well above the world’s underlying speed limit of around 4%.
国际货币基金组织本周称，预计今年全球GDP将会增长4.8%--低于金融危机前繁荣期的增长率，但远高于世界的大约4%的增速极限。
Working to let go of the pace around you and creating your own speed takes time and should be attempted in small, incremental steps.
试着从整个世界的快节奏的中放手吧，试着创制一种从容不迫得自己独有的节奏，然后再慢慢增加工作量。
Speed and reliability in travel search, especially around flights, is an extremely difficult area to master.
旅游搜索的速度和可靠性最难掌控，尤其是对于机票搜索。
Uniform circular motion occurs when an object goes around in a circle and when the speed never changes.
匀速圆周运动发生在，当物体沿着一个圆环滚动，速率恒定的情况下。
Uniform circular motion occurs when an object goes around in a circle and when the speed never changes.
匀速圆周运动发生在，当物体沿着一个圆环滚动，速率恒定的情况下。
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