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。
These massive seabirds use a wingspan topping 8 feet (2.5 meters) to glide gracefully, often for hundreds of miles, using thermal updrafts to gain altitude.
5米优雅地滑翔，经常飞翔数百里，它们利用热上升气流升高。
Kalwall has good thermal insulation properties and allows a high level of daylight penetration, so its northerly aspect meant that there was little or no risk of solar heat gain throughout the year.
Kalwall具有良好的隔热性能，并允许高层次的日光渗透，所以它朝北意味着全年都极少或者没有获得太阳能热的风险。
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