(1) 入(进，门)口 (door or passageway through which one enters) [C，N(to)]：the～to a building/a city/a harbour 大楼/城市/港口的入口; block the～to ... 堵住……的入口; The church has an impressive～. 这座教堂的大门非常别致。The～to the garage is at the back of the house/on your right/opposite the bookstore. 车库的门在房子的后面/你的右边/书店对过。Where is the～to the tunnel? 地道的入口在哪儿? place a guard/meet sb at the front～在前门设门卫/与某人见面; There are many～s.有许多入口。〖同〗entry，entranceway，door，doorway，gate，gateway，opening，passageway;〖反〗exit;

(2) 进入，入(出)场 (act of entering) [U，C，N(into/onto)]：the candidate's～into politics 那位候选人进入政坛;the Prime Minister's～into office 首相就职; make one's～into/onto sth 进入; force an～into 强行进入; gain an～挤进; an actor's～on stage 演员上场; allow (have) free～to 允许自由进入; No～! 不准入内! The actor's～was greeted with applause. 那位演员的出场受到了热烈的欢迎。〖同〗 entry，approach，appearance; 〖反〗 exit，departure;

(3) 入场(会，学，港)(权，费) (permission，right，or ability to enter; admission) [U，N(to)]： apply for～to the university 申请入学; E～to the college is by examination. 只有通过考试才能入学。They were refused/denied～to the club because they are too young. 由于太年轻，他们未获准加入该俱乐部。～free 免费 入场; a university～exam (大学的)入学考试;～fee 注册费;～requirement 入学标准; 〖同〗 entry，admittance;

【辨异】entrance与admission和admittance的区别见ADMISSION。