The field may be provided by permanent magnets or by electromagnets.外地可能提供的永磁材料,或由电磁铁.The rails of their Maglev train were made of about 100 magnets.他们所做的磁悬浮列车轨道采用了约100块磁铁.Magnets are used for the controller's attac...
The Netherlands has been reclaiming farmland from water.荷兰人一直在围海造地。People here are reclaiming land from the sea.这儿的人们正在填海拓地.Draining and reinforcing material for reclaiming seabeach and swamp.海滩和沼泽地开垦的排水材料和加固材料....