一门: a course in a curricuclum; a ...课: class旁听一门课: audit a course一门课程: a subject注册，学习一门课程: sigh up for退掉: reject参加俱乐部；注册，学习一门课程: sigh ufor一门: a course in a curricuclum; an (artillery piece) 一门炮 an artillery piece; 逻辑学在这里是作为单独一门课来讲授的。 logic is taught here as a separate subject逻辑学在这里是作为单独一门课来讲授的: logic is taught here as a separate subject入门课: gateway course一门炮: artillery piece掉一个方向: swing勾掉一句: strike out a sentence划掉一个字: cross out a word忘掉一切: to forget to about it all宕掉一半: fram9门课程: f1-f9入门课程: introductory course先学入门课: intro/basic/prerequisite修四门课: take four courses重修（某门课）: take (a course) over专门课程: specialized coses; specialized courses或一门艺术: cappuccino某一门科学: c branch of such knowledge哪一门语言: what language
