All modules can be purchased separately.

所有的光学组件均可分开购买。

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To display pressures and temperatures, sensor sets needs to be purchased separately.

要显示的压力和温度，传感器设置需要单独购买。

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Beginning in V6.2, Portal is no longer included with the product and must be purchased separately.

从V6.2开始，该产品中不再包括Portal，必须单独购买Portal。

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The Touch 10 monitor also supports a capacitive stylus (purchased separately) should the user prefer a pen-like interface.

ENGADGET: LG announces 23-inch Touch 10 monitor with Windows 8 optimization

Professional graphics cards are purchased separately by professionals to get 3D graphics performance that is superior to the graphics cards that come installed in their PCs.

FORBES: Nvidia Stuck As AMD Shows Up To Eat Its Lunch

The Roku Streaming Stick, when purchased separately and not bundled with a device, comes with a Roku enhanced remote which features volume buttons and motion control for game play.

ENGADGET: Roku Streaming Stick launches in October for $99, Vudu comes to the Roku platform today