In the historical period, the good forest covering, the sufficient water resource and the clouding and humid environment provided the essential condition for malaria's production in Sichuan area.

历史时期，四川地区良好的森林覆盖、充足的水源补给以及湿热封闭的环境都为瘴气的产生提供了必要的条件；

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Offer to match your technical expertise with their experience in teaching to create a class or program covering forest issues.

主动将你的技术专长与对方的教学经验相联系，利用课堂或课程阐述森林问题。

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A feld was not necessarily ground broken for arable, but any open country in the almost all-covering fifth-century forest.

Feld不一定只指开垦为农耕用途的土地，而是指任何空旷的地方（五世纪的英国，森林几乎覆盖了所有地方）。

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The force of the explosion laid waste to a dense area of forest covering more than 2000 square kilometers.

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With accommodation in huts along the way, the hike runs through the moist, high-altitude forests covering the Outeniqua Mountains above Knysna, finishing in Harkerville Forest.

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National Geographic Expeditions runs tours throughout the year for the same price, covering natural wonders like Easter Island and the tropical Daintree rain forest in Australia.

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