Suetion devices are inadequate in gravels or very porous soils.吸水装置对砂砾或非常疏松的土壤是不适用的.They are more prevalent in soils of the tropical and subtropical regions.它们在热带和亚热带地区的土壤中较为普遍.Some soils are actually too alkaline for ce...
They were knocked to the ground, beaten senseless and robbed of their wallets.他们遭重拳击倒在地，被打得不省人事，钱包也被抢走了。Wallets may have gotten thinner during this recession, but waistlines have expanded.在这次经济衰退中,人们的钱包可能瘪了, 但腰围却鼓起来了.Sta...