英特网对那几乎它传输数据的即时速度是显着的。
The Internet is remarkable for the almost instantaneous speed at which it transmits information.
在伽利略生活的年代，人们还不会计算作变速运动物体的即时速度。
In the Galileo's times, the people still could not calculate the forthwith speed of variable motion's object.
归结起来，大约有四种主要类型的问题：第一类是研究运动的时候直接出现的，也就是求即时速度的问题。
To sum up, there are about four main types of problems: the first is to study the movement occurs when the direct, nor is the desire for instant speed.
尤尔韦特松讲了一个故事：他和儿子曾经把一支火箭的速度提升至2.5马赫(即时速约1,900英里)，但尾翼随后脱离，造成了严重故障。
Jurvetson tells a story about the time he and his son pushed a rocket to Mach 2.5 — approximately 1,900 miles per hour — before a fin separated and caused a critical failure.
尤尔韦特松讲了一个故事：他和儿子曾经把一支火箭的速度提升至2.5马赫(即时速约1,900英里)，但尾翼随后脱离，造成了严重故障。
Jurvetson tells a story about the time he and his son pushed a rocket to Mach 2.5 — approximately 1,900 miles per hour — before a fin separated and caused a critical failure.
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