He spent hours throwing a tennis ball against a wall.他好几个小时都对着一堵墙掷网球。The lifeboat capsized, throwing the occupants into the water.救生艇倾覆，艇里的人被掀入水中。Hammer-throwing for women is not yet a major event.女子链球运动还不是主要的赛事。...
A two - step process has been developed to recover cobalt from arsenite ores.为了从亚砷酸盐矿中回收钴,开发了二段工艺.The absorption reactions of goethite and its precursors on arsenite were studied.观察了针铁矿及其前体对溶液中亚砷酸根离子的吸附过程和吸附性能.Copper ars...