Step 4: Compose a request message.

步骤4：编写请求消息。

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One conclusion researchers made about why texting is so dangerous is the length of time it takes to compose a message while driving.

为什么开车时发短信如此危险呢？ 研究人员得出的结论是，问题就出在编写短信的那段时间。

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Message types. These are used to compose complex messages from existing data types and primitive types.

消息类型。这些是被用来从现有的数据类型和原始类型组成的复杂消息。

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Insoo doesn't even have to take the phone out of his pocket to send an SMS. He knows how to slide it open, which buttons to push how many times to reach the "Send SMS" menu option, compose the entire text message, and hit the send button -- all without even looking at the phone.

CNN: A day in the (digital) life of a South Korean boy