This paper constructs a new practical distance learning system that is low cost and high speed by the means of satellite LOG combining with ground connection well.

该文从实际出发，通过卫星通信线路和地上线路的有机结合，构筑了低成本、高速率的基于卫星的远程教学系统，并在其上进行了模拟教学实验。

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The amount of time for a wave to travel a certain distance, proportional to the reciprocal of velocity, typically measured in microseconds per foot by an acoustic log and symbolized by tor DT.

波在某段距离传播的时间，与速度的倒数成正比，在声测井中，以每英尺多少毫秒来量度，用符号t或DT表示。

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By wielding the software, users can monitor and set goals for calories burned, distance and duration, and even log their actions outside the gym for activities ranging from rollerblading to skiing.

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