Describes boolean operators and logical expressions 討論布爾運(yùn)算符和邏輯表達(dá)式。
This can be over ridden by inserting a different boolean operator either " or " or " andnot " 這能完了由也插入一個(gè)不同布爾操作員騎“或”或“ andnot ” 。
Choose the boolean operator to use to combine this expression with the expression in the next row 和/或選擇布爾運(yùn)算符將此表達(dá)式與下一行中的表達(dá)式組合使用。
Boolean operators of the same type and , or are associative and can therefore be applied in any order 相同類型的boolean運(yùn)算符( and 、 or )可以結(jié)合使用,因此可以按任意順序應(yīng)用。
The following boolean operators can be used to combine terms . note that they must be capitalized 下面的邏輯檢索詞可以用來(lái)聯(lián)合檢索詞進(jìn)行檢索。注意:這些詞在使用時(shí)必須大寫!