你必须随身携带身份证件。
不幸的是，你必须随身携带必要的设备，因为几乎不可能找到天然的替代品。
Unfortunately, you must carry the necessary equipment with you, since it's all but impossible to find natural substitutes.
如果您使用的是笔记本电脑，并且笔记本电脑中没有内置麦克风，那么还必须随身携带麦克风。
If you are a laptop user, you have to carry around the microphone if one is not built into your laptop.
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