So if the bacterial odor molecule is present, the CO2 sniffers turn off, presumably to allow the mosquito to concentrate on the close-range foot target.

因此，如果这个细菌的气味的分子出现的话，二氧化碳的探测则终止。这大概是为了让蚊子去专心于眼前的食物吧。

For example, in our sinuses, there are millions of receptor proteins that detect different odor molecules by switching from an 'off state' to an 'on state.

比如，鼻窦就有几百万个检测不同气味分子的受体蛋白，可实现从‘关闭状态’到‘开启状态’的转换。

The flowers gave off a fragrant odor.

花发出一阵幽香。

The room gave off a clean, sharp odor of linseed oil that reminded me of my father's clothes when he had returned from the tile factory at night. It smelled like wood and fresh-cut hay mixed together.

室内散发着一股清新、刺激的亚麻籽油气味，使我想起晚上父亲从瓷砖工厂下班后，衣服上残留的味道，闻起来像木头与新割的干草混在一起。

Second, scientists might be able to isolate the cocktail of compounds that gives off the odor to develop lab instruments or automated field detectors.

第二，科学家们可能在众多的化合物混合物中分离出放出这种气味的化合物，从而可以开发出实验室使用的仪器或者自动化的野外探测器。