study作书房可数吗

　　That evening we sat together in his study.

　　那天晚上我们一起坐在他的书房里。

　　Quite a lot of South Americans study here.

　　相当多的南美洲人在这里学习。

　　Children are hard at work in the study hall.

　　孩子们在自习室里刻苦学习。