By tracking this ratio over time, he can determine how long gas has taken to reach the surface and gain clues to the chemical, thermal, and mechanical state of the rocks the gas is passing through.
通过追踪该比率随时间的变化，他可以确定氡气到达地表需要花费多长时间，同时获得气体所通过的岩石的化学、热力学和机械状态。
Secondly, according to the needs of UAV location tracking, the paper analyzes the advantages and weakness of mechanical, magnetic sensing, GPS, ultrasonic, inertia and optics tracking technology.
其次，根据无人机定位跟踪的需要，分析比较了机械式跟踪技术、磁传感跟踪技术、GPS跟踪技术、超声波跟踪技术、惯性跟踪技术和光学跟踪技术的优缺点。
Secondly, according to the needs of UAV location tracking, the paper analyzes the advantages and weakness of mechanical, magnetic sensing, GPS, ultrasonic, inertia and optics tracking technology.
其次，根据无人机定位跟踪的需要，分析比较了机械式跟踪技术、磁传感跟踪技术、GPS跟踪技术、超声波跟踪技术、惯性跟踪技术和光学跟踪技术的优缺点。
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