植物由于具有螯合机制可能影响土壤的化学特性.Plants may possibly influence soil chemistry by the possession of chelating mechanisms.确定螯合 -- 溶剂萃取法所得到的检测限颇为困难.It is difficult to define the detection limits obtained by chelation - solvent extract...
在彼得斯堡，过去5年中有30名巡警死于暴力事件。In Petersburg, 30 patrolmen have died violently in the past five years.公路巡警关闭了这条路。Highway patrol officers closed the road.由于这次过失,他被降了级,又被打发去干徒步巡警了.For this peccadillo he was demoted and sent back ...