Physical scientists monitor factors such as forest height and above-ground forest biomass using remote-sensing data from drones or satellites.

物理科学家利用无人机或卫星的遥感数据监测森林高度和地上森林生物量等因素。

Paul studies forest height and density in places like Alaska and Siberia.

保罗研究阿拉斯加和西伯利亚等地的森林高度和密度。