传统的刀耕火种农业方式耗尽了土地的肥力。Traditional slash and burn farming methods have exhausted the soil.为保持土壤肥力,农民搞作物轮作.Farmers rotate their crops so that the soil will remain fertile.蚯蚓吃下大量土壤，排出肥力丰富、物理结构理想的腐殖质。Earthworms consume large a...
Methods: CEM ×174 cells were infected with SIV and treated with different concentrations of methionine enkephalin.方法: 用SIV感染CEM×174细胞并加入不同浓度蛋脑啡肽.Non - toxic inhibitor for esterase, lipase and N - formyl - methionine amin...
In medieval times , a statue of Venus stood on Il Campo.在中世纪, 坎普广场上曾立有一尊维纳斯雕像.Introducci � � n general del Campo XX - Jefe de Campo.对XX工地的总介绍-工地长.Tras el descanso , los jugadores saltan al campo.中场休息后, 球员们走进场地....
Doran stuck his head out of the window to acknowledge the cheering.多兰将头探出窗户向欢呼的人们致谢。She's feeling a bit down in the dumps and needs cheering up.她情绪有点低落，需要振奋起来。Most will probably be cheering on their favourite player...