Still smaller versions the size of specks of salt can be added to paint, turning entire surfaces into wireless sensors that can detect motion or act as smoke alarms or security systems.

更小一点如盐粒大小的传感器可以被掺入油漆中，把整个表面变成无线传感器——可以侦测物体的运动或是担当烟雾警报器、安全系统。

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What's interesting about this is that the dogs were able to detect cancer even in the presence of other factors, like tobacco smoke and COPD.

有趣的是，狗甚至能在其他因素(例如烟草烟雾和慢性阻塞性肺病)存在的情况下探查出癌症。

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Most important, smell disorders can be downright dangerous for those who cannot detect the odor of smoke, burning or spoiled food, natural gas or other noxious aromas.

最为重要的是，嗅觉障碍对那些不能够觉察到烟味、烧焦味、食品馊味、天然气或其他有毒气体味道的人来说危险到极点。

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