earths field 中文意思是什麼
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According to the configuration and ecotope of the earths surface, the coverage of vegetation, occupation ratio of bare sandy land and the soil texture were selected as evaluation indexes by using the field investigation data
利用外業調查數據，依據地表形態和生態狀況的變化，確定了植被蓋度、裸沙地佔地百分比和土壤質地3項評價指標，並建立了基於遙感的科爾沁沙質荒漠化評價指標體系，其中裸沙地佔地百分比用混合像元分解的方法獲得。 -
When the electric field arising from the piling up of charges reaches a certain breakdown value, lightning discharges take place between clouds or between cloud and the earths surface. the explosive expansion of the surrounding air produces the rolling sound of thunder
當電荷累積而形成的電壓過大時，雲與雲之間或雲與地之間就會出現閃電放電現象，放電通道周圍的空氣會急劇膨脹而產生隆隆雷聲。 -
An iron case will keep the earths magnetic field away from the compass
鐵箱能使地球磁場影響不了指南針 -
The incoming streams of solar protons and electrons are affected by the earths magnetic field in a complicated way.
太陽的質子和電子的入射流，受到地球磁場的復雜作用。
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