armchair之前用啥介词

前面用介词in，例如：

1、He was lying sprawled in an armchair， watching TV.他四肢伸开正懒散地靠在扶手椅上看电视。

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

3、One man sat in an armchair， and the other sat on the front of the desk一个男人坐在扶手椅里，另一个坐在桌子前面。