the serpentine course of the river蜿蜒曲折的河道Serpentine often contains some asbestos , and should be used with caution .因为蛇纹石往往包含了一些石棉，收集时应谨慎。One part of the Serpentine is kept for swimmers.蜿蜒河的一段划为游泳区....
Serpentine often contains some asbestos , and should be used with caution .因为蛇纹石往往包含了一些石棉，收集时应谨慎。...serpentine woodland pathways.蜿蜒的林间小路The method is presented for preparation metasilicate pentahydrate from residue after...