But people have been known to 'beat' the test using a range of techniques, such as controlling breathing and heart rate.

但是人们早已熟知运用一系列方法“搅乱”测试，例如控制呼吸和心率。

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And though several European airlines conducted successful test flights in the danger zone, the engines of a Finnish military jet suffered considerable damage as a result of breathing in the ash.

尽管几家欧洲航空公司成功进行了穿越火山灰区域的测试飞行，但是因发动机吸入火山灰，芬兰一架喷气式战机损失惨重。

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There are a number of things you can do right before and during the test to help you stay calm and confident. Examples include deep-breathing exercises and visualization.

在考前，考试中，你可以做很多事儿帮助你保持平静，自信——比如深呼吸训练，形象化练习。

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In future studies, Sims says that the researchers should diagnose COPD using a breathing test called spirometry.

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They also created something called a carbon monoxide re-breathing test, which they believe is the most effective way to measure how much hemoglobin an athlete is carrying.

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I'm not sure how your metabolism was tested (it can be tested directly by a breathing test, which is available in some gyms and doctors' offices, or it can be calculated using several different formulas), so the significant drop that you report may not be completely accurate.

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