You many sneer, but a lot of people like this kind of music.你可以嗤之以鼻, 但很多人喜欢这种音乐。He said with a sneer.他的话中带有嘲笑之意.Canete's mouth twisted in a contemptuous sneer.卡内特傲慢而轻蔑地撇了撇嘴。There is too great a readiness to sneer at...
聚羟基乙酸的经典制备方法主要有两种:直接缩合聚合法和乙交酯开环聚合法.There are two means available for the preparation of PGA - synthesis polymerization and ring - opening polymerization....