But neutrinos fly in a straight line: Catch one, and you can trace it back to whatever produced it, which makes them one of the easiest means of probing the far reaches of the universe.

如果能捕捉到中微子的轨迹，那么就可以追溯出它的源头，而科学家们就经常使用这一方法来探测遥远的宇宙。

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It is common practice with many message developers to add traces nodes in the line of execution of message flows in order to be able to trace message processing within the message flow.

为了能够跟踪消息流中的消息处理，许多消息开发人员的常用做法是在消息流执行线中添加跟踪节点。

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Here is the breakdown of each trace entry line and the information it provides.

以下是每个跟踪条目行及其提供的信息的详细说明。

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Researchers have been able to trace a line between some of the earliest modern humans to settle in China and people living in the region today.

BBC: Fossil human traces line to modern Asians