这封信是用白宫的信笺纸写的。

The letter, written on White House stationery, is missing the tops of the official letterhead.

该机主要适用于散装扑克、压缩饼干，沙琪玛、报事贴、便笺纸、威化饼干等散状或多件物体集合的三维包装。

The machine is widely applied to transparent film 3D automatic packages in bulk poker, sachima, newspaper stick, scribbling paper, wafer biscuit and other related bulk things.