Brush / Wipe the dust off the desk.
把桌上的灰尘掸/擦掉。
“You’re a very silly person,” the figure in the doorway said, his voice dry as dust.
“你真是个蠢人！”门口那人说，声音干巴巴的。
dust a cap / room
掸掉帽子上的灰/打扫房间