常见例句双语例句It is constructed out of metal plates and rods, arranged helically around a retort stand, and shows one complete turn of the famous double helix.它由一些金属板和金属棒构架而成，螺旋形的围裹在一个蒸馏架上，展示了那个知名的完整双螺旋旋转。每个金属片代表四个碱基之一。 返回 retort stand