Using a mirror, check your head for hair loss.

照一下镜子，看下你的头上有没有掉头发。

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One informal test that some doctors use to check for COPD progression is to have you breathe while raising your arms over your head.

一些医生用来检查COPD进程时，做的一项非常规测试就是在把你的手臂抬过头时要你呼吸气，为什么呢？

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To do this, make a HEAD request and then check for a 404 error in your callback function; Listing 11 shows a sample callback.

要实现这种功能，生成一个HEAD请求，然后在回调函数中检查404错误；清单11给出了一个简单的回调函数。

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And don't forget to check with your Head Teacher first that they are happy for your pupils to complete it.

BBC: School Report Survey: Introductory Lesson

Once you check that off your Phoenix bucket list, head over to the Musical Instrument Museum.

FORBES: 48 Hours In Phoenix

This article made me head over and check out some of the videos you guys have on your site and I was impressed.

FORBES: 5 Trends in the Cloud Forecast for 2011