in a hotel指的是在壹個旅店的裏面，處於其中。還指指在賓館裏工作的。
at a hotel指的是在壹個旅店的周圍和附近，在這個地點。
例句辨析兩個詞組：
in a hotel
1、We spent the night in a hotel.
我們在壹家旅館過夜。
2、We spent a few days in a hotel
我們在壹家賓館住了幾天。
3、A gaggle of journalists sit in a hotel foyer waiting impatiently.
壹群亂哄哄的記者坐在酒店大堂裏焦急地等待著。
4、A bomb exploded in a hotel, killing six people and wounding another five.
壹枚炸彈在壹家旅館爆炸，造成6人死亡，5人受傷。
at a hotel
1、We had an informal party at a hotel, and people just flooded in.
我們在賓館舉行了壹個非正式的晚會，人們蜂擁而至。
2、If you want to stay at a hotel, you have to check in.
妳想住旅館，就得辦理登記手續。
3、They have reserved rooms at a hotel.
他們已預訂了旅館房間。
4、I was working at a hotel on the beach. I was teaching sports-swimming and waterskiing.
我在海邊的壹個旅店工作。我教體育&遊泳和滑水。