armchair之前用啥介詞

前面用介詞in，例如：

1、He was lying sprawled in an armchair， watching TV.他四肢伸開正懶散地靠在扶手椅上看電視。

2、He sat down in the armchair and turned on the radio.他在扶手椅中坐下，打開了收音機。

3、One man sat in an armchair， and the other sat on the front of the desk一個男人坐在扶手椅裏，另一個坐在桌子前面。