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括号()、引号””等需要使用标点符号半角格式,需要成对使用; 逻辑关键词AND/OR/NOT(和/或/非)前后需空一格,输入成功后,逻辑词呈黑色,关键词呈红色; 逻辑关键词需要大写; 关键词英文大小写通用,中文繁简体通用; 英文词组或中英文混杂时建议加上英文格式的双引号来保证机器自动识别的准确度。