但是建立一个碳骨架并不容易。
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。
Phospholipids contain a head group, choline in this case, that is attached the phosphate group to a three carbon glycerol backbone.
红外光谱表明了该双改性树脂的碳骨架上引入了桐油分子长碳链，具有一定的柔韧性和油溶性。
IR spectra showed that long chains of molecules of tung oil were bonded on the skeleton of boron phenolic resin.
对于第一步画出骨架，其实比刚才更容易,因为我们没有一个中心原子，我们这里只有碳和氮两个原子。
So in terms of the first step of skeletal structure, this is actually going to be easier because we don't have a central atom, we just have carbon and nitrogen here.
和大部分六碳糖分子不同，木糖醇是以五碳为骨架的。
Unlike most sugar molecules which are based on a six-carbon structure, Xylitol is based on five carbon atoms.
新工艺条件下焦炭的失碳率显著增加，导致焦炭性能恶化，对于起骨架作用的焦炭提出了更高的要求。
The carbon loss ratio of coke increases with the H2 ratio increases, the properties of coke is deteriorated, it has higher request to coke which act as frame in BF.
新工艺条件下焦炭的失碳率显著增加，导致焦炭性能恶化，对于起骨架作用的焦炭提出了更高的要求。
The carbon loss ratio of coke increases with the H2 ratio increases, the properties of coke is deteriorated, it has higher request to coke which act as frame in BF.
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