1、介词across作横过，穿过，跨越讲，例如a millions of schools across the world全世界范围内数以百万计的学校，across the years多年来，等等
3、介词across和有关动词连用，表示偶然碰到，例如come across, drop across, fall across sb. ran across等等
5、副词across和有关动词搭配，表示使其理解或领会，例如 He put himself across to the voters as a suitable leader
