The next block should look familiar: It prints a usage message if no arguments are provided.

下一个块应该是非常熟悉的：它在未提供参数时打印用法信息。

youdao

This provides the basic definition of a message, which ACTS as a container holding address, payload, and flags to send and block for a message.

它提供消息的基本定义，它充当一个容器来容纳消息的地址、有效负载及关于发送和阻塞的标志。

youdao

The third block displays a confirmation message.

第三个块显示确认消息。

youdao

But in the meantime police sealed several of his rivals' campaign headquarters, suspended updating to their websites and continued the nationwide block of message services on Iranian mobile-phone networks that had been imposed during polling.

ECONOMIST: Iran's election

We also saw a brief demo of the prototype application, and sure enough, it showed us when an LED block was placed backwards with an error message -- you can see it in action in the video below.

ENGADGET

If an advertiser chooses to merely block and tackle, lacking human relevance, his message will die a quick death.

FORBES: gyroVoice: Less Fartsy, More Artsy: The Evolution of Advertising Into an Art Form