但若使用特制接收设备，几乎任何电路都有被窃听的可能。
As you probably already know, when an identifier starts with a capital letter it is exported — that is, it's visible to code outside of the package it's declared in. This means that the casing of the first letter is significant. It impacts the behavior of your codebase. In turn, this means that you shouldn't start identifiers with a capital letter just because they look nice — you should only start them with a capital letter if you want them to be exported and accessible to code outside the package they are declared in.
，这一点在有道翻译中也有详细论述
rnd: Only kSecRandomDefault is supported.
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