Install a CO detector to alert you of the presence of the deadly, odorless, colorless gas.

安装一氧化碳检测器来警告是否存在这种致命的、无色无味的气体。

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Unfortunately, the relatively low sensitivity of sputum smear microscopy - even more so in the presence of HIV co-infection - is a major drawback to case-finding.

不幸的是，痰涂片镜检的敏感性相对较低，对于合并感染艾滋病毒的患者则更低，这是病例发现方面的一个重大障碍。

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In these cases also, the presence of multiple co-located applications might make it more difficult to drill down to the root cause.

在这些情况下，多个应用程序的共存可能使探究问题的根本原因更加困难。

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He's 63, and a familiar and genial presence as the co-host of ABC's Good Morning America.

NPR: Charlie Gibson to Anchor ABC's 'World News'

With sites like Facebook, Instagram and Twitter growing easier to peruse and participate in via phone, the temptation to zone out while in the presence of family, friends and co-workers will grow even more difficult to resist in 2013.

FORBES: Four Big Questions (and Predictions) for Social Media in 2013

The Reverend Keith Osmund-Smith, co-ordinator of the Telford group, said their presence on the street would reduce anti-social behaviour.

BBC: Shropshire's Street Pastors' first night out in Telford