The burst of light is called a photon echo; and its observation proved we have full control over the quantum state of the atoms.
辐射出的光被称为光子回波，它的观测表明我们对于原子的量子态进行了完全的控制。
2
Acoustic processing and echocontrol Sound pickup and playback is an important area of multimedia processing.
声学处理和回声控制拾音和重放是多媒体处理的一个重要领域。
3
This example USES a predefined "ping" Nagios plug-in, which sends Internet Control Message Protocol (ICMP) echo requests to determine if a host is responsive or not.
这个示例使用了一个预定义的“ping”Nagios插件，它将发送Internet控制信息协议(Internet Control Message Protocol, ICMP)回显请求以确定主机是否有响应。