一项宪法修正案使得任何总统的任职不得超过两届。A constitutional amendment precludes any president from serving more than two terms.他任职于外交关系委员会。He was on the Council of Foreign Relations.据说他曾在宫廷中任职多年.He was said to have served at court for years...
地球既公转又自转.The earth revolves both round the sun and on its own axis.地球自转与地球绕日公转产生附加的频移.The earth's rotation and its motion around the sun add an appreciable frequency shift.月球的自转与公转精确地同步.In the case of the moon the r...