PubMed检索策略的制定之各个符号意义

parentheses ( ) - used to create Boolean nesting (括号（）-用于创建布尔嵌套）

square brackets [ ] - search field tag qualification (方括号[]-搜索字段标签资格)

ampersand & - Boolean operator AND (＆运算符＆-布尔运算符AND)

pipe | - Boolean operator OR (管道| -布尔运算符OR)

forward slash / - MeSH/Subheading combinations (正斜杠--MeSH /副标题组合)

comma , - typically forces a space, e.g., a,b is translated to a, b (逗号-通常会强制使用空格，例如,a,b转换为 a,b)

colon : - designates a range operation (冒号：-指定范围操作)

double quotes " - used to force a phrase search (双引号“-用于强制词组搜索)

pound sign # - designates a History search statement when immediately followed by a number, e.g., #1 AND cat (井号＃-在紧随其后的数字（例如＃1 AND cat）后指定“历史记录”搜索语句)

asterisk * - wildcard symbol for search term truncation, e.g., toxicol*(星号*-搜索词截断的通配符，例如，毒酚*)

Characters converted to spaces in search queries(在搜索查询中转换为空格的字符):

（前面的都是符号的英文名称，忽略即可）

exclamation mark !

pound sign #

dollar sign $ 

percentage sign % 

asterisk * 

plus symbol + 

minus symbol - 

period . 

semi-colon ; 

angle brackets < > 

equal sign = 

question mark ? 

backslash \ 

caret ^ 

underscore _ 

curly brackets { } 

approximately ~

Some characters are preserved during indexing to assist with the retrieval of substances, e.g., 1'-methyl（在索引过程中保留了一些字符，以帮助检索物质，例如1'-甲基）

single quotes ‘（单引号）

hypens -（连字符）