These include one-shot exchanges such as DNS lookup, where the cost introduced by BEEP would be disproportionate, or tightly coupled RPC protocols like NFS.

其中包括只有一次的交换，如DNS查找，这里由BEEP引起的成本将不成比例，还包括紧密耦合的RPC协议，如nfs。

youdao

So leave a message at the beep and baby, they'll call you back one more time.

NPR: Annoying Mother's Day Music

One customer created a device that uses the gps module to wake him up with a loud beep whenever he sleeps past his train station.

FORBES: Bug Labs is going after the long tail of gadgetry