A message consists of a header, an empty line, and a body.

消息包括一个标题、一个空行和一个主体。

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For example, Line 2 shows a check that determines if an empty string has been provided.

例如，第2行检查提供的是否是空字符串。

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This line also traps for a null value and converts it to an empty string to prevent problems during later processing.

这一行代码也会专门处理null值，它将null值转换为一个空字符串以避免后面的处理出现问题。

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You could follow it from there by looking at the empty spaces in a solid line of trees, the rootballs waving their witchy root toes in the air.

WSJ: Anna Quindlen on a Message Delivered by Tornado | House Call

This exploits one of the predictions of Einstein's general theory of relativity: that the path of a beam of light (which is a straight line in empty space) is bent inwards by the gravity of a massive object.

ECONOMIST: Cosmology: I spy with my little gravitational lens | The

The confidence of the home side was visibly growing, and Nicky Wroe even went for goal from the half-way line, punting a long range effort beyond the empty Burton goal with Deeney stranded.

BBC: Torquay 2-1 Burton