计算机在书桌上。
The computer is on the desk. The books are on the shelf.
电脑在桌子上面。这些书在书架上面。
All you want on the surface of your desk is your phone, computer, inbox, and maybe a special photo in addition to the documents you are working with at the moment.
你要放在办公桌子上的东西只有电话、电脑、收件箱，除了你正在使用或处理的文件还可能有一张特别的照片。
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