A “foyer” is the lobby of a public building or the entrance hall or vestibule of a private dwelling. In private dwellings, it is usually not large. “Hall” has a number of meanings. It can be a corridor or passageway in a building, a large entrance room or lobby in a building, a building for public gatherings or the large room where such events are held, a school building that provides classrooms, dormitories or dining facilities for students. In the French part of south Louisiana, “hall” used to be used to refer to the living room or parlor, the principle room for entertaining, although it is no longer used in that sense. Foyer: 门厅, 休息室 Four new paintings hung in the foyer. 在门厅悬挂展览四幅新的绘画作品 Late arrivals must wait in the foyer. 来晚的人要在门厅等候。 A giant photograph of the actor hung in the foyer of the theatre. 那位演员的巨幅照片挂在剧场的休息室里。 Hall: 大厅, 礼堂 A multitude of people gathered at the doorway of the exhibition hall. 大群人聚集在展览大厅的门口。 There were plenty of people in front of the Town Hall. 在城镇的大礼堂前有许多人。 There was a low murmur of conversation in the hall. 大厅里有窃窃私语声。 The systematic arrangement of chairs makes the hall look spacious. 座椅按照顺序排列，这使得礼堂里显得很宽敞。 His voice echoed in the big empty hall. 他的声音在空荡的大厅里发出回声。 Morning assemblage is held in the school hall. 晨会在学校礼堂举行。

a hall links two or more rooms together, another word would be corridor. a foyer is the 'room' or area where you enter a building (such as a hotel, company headquarters) and generally wait until you go to the room you are going to. It can also be called the Reception, as this is normally where the reception and receptionists will be.