外籍勞工 外籍家事工作者 國際勞動基準 聯合國 國際勞工組織 歐洲聯盟 北美自由貿易協定 一九九○年所有移民勞工及其家庭權利保障公約 Foreign workers Domestic foreign workers International labor standards United Nations International labor organization European Union North American free trade agreement International convention on the protection of the rights of all migrant workers and members of their families