它的特点包括内置CD - ROM驱动器，用户可自行置换的电池，红外口，以及内置输入笔。

It featured a built-in CD-ROM drive, a user replaceable battery, a large IR port, and a built-in stylus.

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在测试组件时，您可以选择可置换元素作为组件测试的输入。

When testing a component, you can select substitutable elements as input to a component test.

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置换组是可兼容内容模型交换元素的机制。

Substitution groups are a mechanism for swapping elements of compatible content models with each other.

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