可附键盘托架价格从30美元到200美元不等。

Attachable keyboard drawers range from $30 to $200.

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它有一个可移动托架，有一个能把纸从一行转到另一行的杠杆，还有一个按字母顺序排列的键盘。

It had a movable carriage, a lever for turning paper from line to line, and a keyboard on which the letters were arranged in alphabetical order.

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外置式显示器安装支架，键盘放置托架。

External monitor mounting bracket, hidden keyboard tray placed.

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