词典释义：
a woman or girl in relation to other daughters and sons of her parents
姐妹。
a close female friend or associate, especially a female fellow member of a trade union or other organization
亲密女友（或女同事，尤指工会或其他组织的女性成员）。
(常作
修女；女教友。
a fellow woman seen in relation to feminist issues
（女权运动中的）姐妹。
〈非正式，主北美〉 大姐；小妹（主要为黑人之间的称呼语）。
[usu. as modifier]a thing, especially an organization, which bears a relationship to another of common origin or allegiance or mutual association
（尤指组织之间的）姐妹（关系）
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Securicor and its sister company Securicor Services 安全投递公司和它的姊妹公司——安全押运服务有限公司
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a sister ship .姐妹船。
(常作
〈英〉 护士长。
"Old English, of Germanic origin; related to Dutch
