由此构成的下位机数据采集系统，只有当采集信号有明显变化时，才将相关数据向上位机传送。
In the system, the data acquisition task was done by a lower level computer, and only when the value of a signal was "obviously changed", data transfer was proceeded.
导出了线元切向量的变形方程以及拉伸轴在极射赤面投影图上位置变化计算公式。
The purely kinematical equation for the tangent vector of a line element is derived.
二十四节气，是古人根据一年中太阳在黄道上位置的变化情况来确定的。
The 24 solar terms were determined by the changes of the sun's position in the zodiac all through the year.
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