基本解释立体效应同根派生 stereoeffect相关词英汉例句The Stereoeffect on the Crystallization Behaviors of the Aromatic Polyamide Oligomers and Their Block Copolymers with Aliphatic Polyamide 空间立体结构对芳香聚酰胺及其嵌段共聚物结晶行为的影响stereoeffect更多例句