The aroma should be clean and fresh, without any of the off-odors mentioned above.

葡萄酒的香气应该是干净和新鲜的，不含以上提到的任何缺陷气味。

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Now chemists have developed a technique that identifies what kind of degradation process an old book or historical document is going through, based on the odors it gives off.

现在，化学家们研发出一种技术，这种技术基于旧书或是历史文档所散发出来的气味，能够鉴别出它们所经历的不同老化过程。

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When bacteria stagnate, they multiply and give off toxins and stinky odors.

当细菌停滞时，它们会繁殖并释放毒素和臭气。

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Pheromones have been popularized as a factor in sexual desire -- namely, that certain odors that people give off attract potential mates -- but their role in humans is still controversial.

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