derivet除铆钉derivev.获取；得自；起源derived equivalence导出等价derived information[计] 导出信息derived normal ring导正规环derive a conclusion得出结论derived carbohydrate衍生糖derived sound system导出声系统derived distribution导出分布derived high polymer衍生高聚物derive pleasure from从 ... 中找到乐趣derived normal model导出正规模型