extraction n. 1.抽出,拔出。 2.【化学】提取(法);萃取(法);回收物,提出物;精炼。 3.精选,摘要。 4.血统,家世,出身。 5.【数学】开方,求根。 spirit of the first extraction 原汁酒。 a man of foreign extraction 外国(血统的)人。 extractions from a book 一本书的内容摘录。 an extraction of 81 percent 百分之八十一的出粉率,八一粉。 the extraction of root 【数学】开方法,求根法。
Recently , with downhole enterprises coming off from oil - extraction units , they begin to take the parts in which they serve for oil - extraction enterprises 近年来,随着井下作业单位从采油单位的逐步剥离,井下作业企业对原油生产企业的服务地位开始确立。
Recent research has demonstrated the strong performance of hidden markov model applied in information extraction . however , the information extraction based on hidden markov model generally takes a token as a basic extraction unit , and the information of format and list separators is not taken into account . based on the natural structure of text , a block - based hidden markov model is provided 目前基于隐马尔科夫( hmm )信息抽取模型一般以单词作为基本抽取单位,考虑到文本排版格式、分隔符等信息的存在,文本实际上可以看作是由一些文本分块序列组成,同一分块内的所有单词只可能属于同一个状态,而不同分块可以属于一个或多个状态。