磷脂上的脂肪酸尾部可以是没有双键的饱和的，也可以是有一个或多个双键从而不饱和。
The fatty acid tails on phospholipids can be saturated with no double bonds or unsaturated with one or more double bonds.
烯烃：含有一对或多对由双键连接的碳原子的一类不饱和烃。
Olefin (or alkene) Any unsaturated hydrocarbon containing one or more pairs of carbon atoms linked by a double Bond (see covalent Bond, saturation).
合成了既有环氧基团又含不饱和双键的环氧丙烯酸单酯树脂。
A dual-curing epoxy monoacrylate resin was synthesized, which contain both epoxide groups and unsaturated double bonds.
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