Test smoke, carbon monoxide and security alarms to make certain they work it’s a good idea to replace batteries even if they are still working.

检查一下烟警报器、二氧化碳警报器和安全警报器，保证其工作正常。 即便是它们现在仍能工作，给它们换换电池也是个不错的主意。

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Alarms. Test smoke, carbon monoxide and security alarms to make certain they work it's a good idea to replace batteries even if they are still working.

警报器。检查一下烟警报器、二氧化碳警报器和安全警报器，保证其工作正常。即便是它们现在仍能工作，给它们换换电池也是个不错的主意。

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A small subset of studies in the review did try to answer that question by experimentally manipulating how much carbon entered test plots of soil.

评审中进行的小型研究确实通过在实验中控制进入实验田土壤的碳量尝试回答那个问题。“那个数据集是尝试性的，不过，它确实蕴含着回输。”

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The test, called a carbon isotope ratio test, can distinguish naturally produced from artificial testosterone.

NPR: Landis Facing Uphill Battle on Doping Charges

Late Wednesday, his lawyer, Howard Jacobs, acknowledged he'd received a written statement that the carbon isotope test showed the presence of synthetic testosterone.

NPR: Landis Facing Uphill Battle on Doping Charges

Hers is not the lab that did the tests on Floyd Landis, but Dr. Ayotte has used the carbon isotope test since the late 1990s.

NPR: Landis Facing Uphill Battle on Doping Charges