The server's response to this request does not echo any data, so the jQuery response function is empty (and could actually have been removed).

服务器对该请求的响应不会回传任何数据，因此 jQuery 响应函数为空（并且实际上可以被移除）。

youdao

In the simplest form, you can send an echo request to a host and find out the response time (see Listing 1).

按照最简单的形式，可以向一个主机发送echo请求并查明响应时间(见清单1)。

youdao

The ICMP echo request failed because the source address and destination address that are specified in an ICMP echo message are not in the same scope.

由于ICM P回送消息中指定的源地址和目标地址不在同一范围内，ICM P回送请求失败。

youdao