外交关系

diplomatic relations(or ties)
中华人民共和国和美利坚合众国商定自1979年1月1日起互相承认并建立～。（中美建交公报）The People’s Republic of China and the United States of America have agreed to recognize each other and to establish diplomatic relations as of January 1,1979./建立～establish diplomatic relations/断绝～ sever(or break off)diplomatic relations; diplomatic rupture/中止～suspend diplomatic relations/恢复～resume diplomatic relations /～升格upgrade diplomatic relations/～降格downgrade diplomatic relations/～破裂break off (or rupture)diplomatic relations