当大帆船驶进南安普顿码头时，几百只小船聚集在其周围。Hundreds of small boats clustered round the yacht as she sailed into Southampton docks.大帆船被轮船代替之前, 象卡蒂萨克号这样的大帆船是用来从中国载运茶叶,从澳大利亚载运羊毛的.Before they were replaced by steamships, sailing vessels like...
传送带下沉重的钢滚筒the heavy steel rollers under the conveyor belt这个大齿轮带动小齿轮使滚筒旋转.This large gear turns the small one to rotate the cylinder.粉碎辊是波纹式滚筒, 还常是螺旋割纹式.These rolls are corrugated cylinders, usually of the spiral type....