a Boolean search is one using the words ‘and', ‘or', and ‘not' to find a word or combination of wordsusing an Internet search engine. For example you could ask to search for ‘car or automobile', or ‘New York and not New York state'. 布尔搜索的(使用and, or和 not或单词组合,用因特网搜索引擎进行搜索)