belonging to or associated with the people or things previously mentioned or easily identified
他们的;她们的;它们的
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parents keen to help their children .热衷于帮助孩子们的父母。
belonging to or associated with a person of unspecified sex
(指性别不确定的人)他的;她的
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she heard someone blow their nose loudly .她听到有人大声地擤鼻涕。
(
(用于头衔)陛下;殿下;阁下;大人
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a double portrait of Their Majesties .国王和皇后陛下的双人肖像。
"Middle English: from Old Norse