hemisphere半球;
equator赤道;
meridian经线;
parallel纬线;
latitude纬度;
longitude经度;
time zone时区;
altitude海拔;
horizon地平线;
sea level海平面;
plain平原;
plateau/highland高原/高地;
lowland低地;
basin盆地;
slope坡地;
cavern洞穴;
valley山谷/溪谷;
canyon峡谷
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