sensitive natural area Terrestrial or aquatic area or other fragile natural setting with unique or highly-valued environmental features(具有独特的或高价值的环境特性的陆地或水地或其它脆弱的自然居住地。)
physical geography The study of the spatial and temporal characteristics and relationships of all phenomena within the Earth's physical environment(研究时间和空间关系的特点,以及地球上一切现象的物理环境。)