Carbon atoms provide the backbone of living matter.
碳原子提供了生活物质的主链。
A polymer has a repeating structure, usually based on a carbon backbone.
聚合物具有一般是基于碳链的重复结构。
Phospholipids contain a head group, choline in this case, that is attached the phosphate group to a three carbon glycerol backbone.
磷脂包含一个通过磷酸基附着在甘油的三碳骨架上的头部，这里是一个胆碱。
Urban rail transit, as the backbone of urban public transit, plays an important part in relieving traffic jams and shaping low-carbon, energy conservation and environmental protection trip mode.
城市轨道交通作为城市公共交通的骨干，对于缓解城市道路交通拥堵，构建低碳、节能环保的出行方式，发挥着重要的作用。
EPA is a polyunsaturated fatty acid with 20 carbon atoms in its backbone, while DHA is a polyunsaturated fatty acid with 22 carbon atoms.
EPA是以22个碳原子为骨架的多元不饱和脂肪酸，而DHA是有22个碳原子的多元不饱和脂肪酸。
EPA is a polyunsaturated fatty acid with 20 carbon atoms in its backbone, while DHA is a polyunsaturated fatty acid with 22 carbon atoms.
EPA是以22个碳原子为骨架的多元不饱和脂肪酸，而DHA是有22个碳原子的多元不饱和脂肪酸。
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