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(1)主人(person who entertains sb else as his guest，usu in his own house)[C]：act as～to one's parents' friends 像主人一樣招待自己父母的朋友;the～city/nation/country for the next Olympic Games下屆奧林匹克運動會的東道主城市/國家/國家; 〖反〗guest;

(2)(廣播，電視的)節(jié)目主持人(person who introduces other performers，such as those on a TV show)[C]：the～on evening's show晚間電視節(jié)目主持人;

(3)旅(酒)館老板(inn-keeper，hotel-keeper)[C]：Your～，John Smith，hopes your stay at the hotel will be a pleasant one. 旅店老板約翰·史密斯先生希望你在旅店居住得愉快。

(4)宿(寄)主(animal or plant on which some lower form of lives is living as a parasite)[C]：～organisms(動植物的)寄生有機體;(apple-tree) act as～s to mistletoe(蘋果樹)作為懈寄生的宿主;(oak-tree) be the～of the mistletoe that grows on it (橡樹)是在其上面生長的懈寄生的宿主;

be/play host to sb招待……：The hotel (university) is～to a group of Russians (this year's conference). 這個旅店招待一批俄國人(這所大學(xué)召開今年的協(xié)商會議)。

→′hostess n女主人;

vt 作主人招待，主辦，主持(act as host of (a party，friendly meeting，TV show，etc))[T+n](infml)：～the games/Olympic Games/show/garden party主辦這次比賽/奧林匹克運動會/表演/游園會