chair 可數(shù)嗎

　　Fred lazed in an easy chair.

　　弗雷德消閑地躺在安樂椅上。

　　I clenched the arms of my chair.

　　我緊緊握住我的椅子扶手。

　　She was rooted to her chair.

　　她坐在椅子上一動(dòng)不動(dòng)。