Essentially, ping sends an echo packet to the device, and expects the device to echo the packet contents back.

简单地说，ping向设备发送一个echo数据包，期望设备把数据包的内容发送回来。

youdao

Multi-Beam Echo Sounder is an absolutely necessary seafloor mapping device with high accuracy and high efficient at 21st century. It is much fitted to sweep mapping for wide area.

多波束测深仪是高精度、高效率的地形测绘设备，适合大面积的扫海测量作业，是21世纪水下地形测量必不可少的测绘仪器。

youdao

A device used underwater to produce pulses of sound, as for an echo sounder.

特殊设计的专用降噪消声装置的采用，极大的抑制了机械噪声。

youdao

He invented the "Les Paulverizer" device which permitted a performer to echo,or repeat, his or her music.

VOA: special.2009.09.27

To make every application on every Apple device act and feel like every other application on every Apple device, and to have the software of every Apple device echo the hardware design it runs on.

FORBES: Apple Looking To Follow Psion's Lead On Consistent UI Design

The device, dubbed Echo, has a 3.5-inch touch-screen when closed but slides open to reveal another screen.

FORBES: Sprint, Chasing Innovation, Readies Phone That Unfolds Into Tablet

It's understandable -- Miracast is a very recent open standard that lets you echo the display from an enabled device like a smartphone or tablet onto your TV (think Apple's AirPlay Mirroring).

ENGADGET: Netgear PTV3000 updated, supports Miracast-ready Android devices