木质素是第二天然聚合物，木质素的降解是碳素循环中的关键一步。
Lignin is the second natural polymer. The biodegradation of lignin is the key step of carbon recycling.
非病毒基因载体主要有脂质体、人工合成聚合物载体、天然聚合物载体、局部基因释放载体等。
Nonviral gene carriers include liposomes, synthetic polymeric vectors, natural polymeric vectors, local gene delivery vectors and so on.
再生纤维是用天然聚合物为原料、经化学方法制成的、与原聚合物在化学组成上基本相同的化学纤维。
Regenerated fiber is made of natural polymers through chemical methods, it has same chemical composition with original polymer.
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