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。Sedge is similar in appearance to grass but has a solid rather than a hollow stem.当时的纸是由纸莎草植物的剥离物制成的.In those days , paper was made from strips of the papyrus plant.在温盖特的岛上,鹭的出现使莎草能够重现.On W...
这些试验的有效性已显得令人怀疑.The tests have been shown to be of dubious validity.他们正在检测这种草药作为杀菌剂的有效性.They're doing tests to evaluate the effectiveness of this herb as an antiseptic.蛋白质还可以作为检测实验治疗有效性的标识物.They can serve as markers...