Just as [when] the two men were leaving, a message arrived.

就在这两个人要离开的时候，突然有了消息。

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Therefore, in order to reply to the message that arrived through the Receive activity, you would need a Reply activity with the same triplet.

因此，为了应答通过 Receive 活动到达的消息，您将需要一个带有相同的三元组的 Reply 活动。

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Via this way the server can also trigger actions in the client (e.g. a new message arrived and the client should display a notification).

通过这个方法，服务器同样可以在客户端激发一些动作(比如，收到新信息的时候，需要在客户端显示一个提示)。

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When Clayton landed in Bangkok, he flipped on his phone and left a voice message to say he had arrived safely, but he didn't do it into a normal voicemail box.

FORBES: Magazine Article

The tough policy means that online shops and e-commerce websites will be shut down if the visitors they get have arrived because of a junk mail message.

BBC: NEWS | Technology | Net firms set sights on spammers

On October 3rd, when Archway employees arrived at the factory for the morning shift, they found the gates locked and a message saying the factory was closed.

NEWYORKER: Out of the Bronx