英语翻译我先声明,要人工翻译,不要网上的词典、工具.Anorchestraisalargegroupofmusicianswhoplayclassicalmusic.Themaininstrumentsoftheorchestrabelongtofourmaincategories：strings,（e.gviolins,violas,cellos）

　　英语翻译

　　我先声明,要人工翻译,不要网上的词典、工具.

　　Anorchestraisalargegroupofmusicianswhoplayclassicalmusic.Themaininstrumentsoftheorchestrabelongtofourmaincategories：strings,（e.gviolins,violas,cellos）,woodwind（e.goboes,clarinets）,brass（e.g.trumpets,trombones）,percussion（e.g.drums）.Theorchestraisledbyaconductor.Theconductermakesurethateverybodyplaystogether,andshowsorchestrawhentoplayquitelyorloudlyandwhenthemusicianshouldstopandplaying.