硬预留
Hard reservation
以上为机器翻译结果，长、整句建议使用 人工翻译 。
不过短信可不仅仅是微小，它们还是搭便车者，硬挤进了为无线网络运营而预留的信道里面。
But text messages are not just tiny; they are also free riders, tucked into what's called a control channel, space reserved for operation of the wireless network.
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