foreign gas杂质气体foreignadj.外来的；外国的；异质的；不相符的Foreign languages as majors外语专业foreign students' educationforeign project contracting对外承包工程foreign exchange allocation外汇分配foreign exchange instrument外汇票据foreign languages education外语教育foreign businesses in trade外贸洋行Foreign Die Casting Machine国外压铸机Foreign Counterintelligence对外反情报foreign numbering plan area外局编号区