管乐器的声音是由振动的气柱产生的.In wind instruments the sound is produced by a vibrating air column.孩子们伴随着管乐器者们吹奏的音乐起舞.The children danced to the music that the pipers were piping.芦笙以二次共鸣区别于其他簧管乐器.Lusheng is different from other reed m...
Others are associated with the protoplasm of the cell.其它一些与细胞的细胞质有关.Each cell possesses a nucleus imbedded in protoplasm.每个细胞都具有核,细胞核位于原生质中.This release of the products of cellular protoplasm to the extracellular fluid a...