Sedge is similar in appearance to grass but has a solid rather than a hollow stem.莎草看上去和普通的草没什么两样，但其草茎是实芯的而不是空芯的。Meyer Sedge fiber is a new type of green fiber.乌拉草纤维是一种新型的绿色环保纤维.Sedge grows in marshes or near water.芦苇生长在...
East Prussian was an exclave of Germany.东普鲁士原先是德国的飞地.These opacities are prooved to be iron - containing substances by Prussian blue stain.普鲁士蓝染色证实为含铁之色素.A Prussian blue iron stain demonstrates the blue granules of hemos...