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。
Now chemists have developed a technique that identifies what kind of degradation process an old book or historical document is going through, based on the odors it gives off.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。
I am even better off than a laboratory attendant, because there are no bad odors here, just the smell of lead burning.
我是绝对免疫的，我甚至比一个实验室工作人员的境况还好些，因为这儿没有不好的气味，只有铅燃烧的味儿。
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。
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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