N-PROPER 山姆大叔（指美国或美国政府） Some people refer to the United States of America or its government as Uncle Sam . 山姆大叔（指美国或美国政府） [mainly US [mainly, also British, journalism]
They are ready to defend themselves against Uncle Sam's imperialist policies.
他们已做好抗击美国帝国主义政策的准备。
For years we were taught that Uncle Sam and foreign investment were the problem.