老鼠嗅到这种气味时会停下来，摩擦双腿，表明样本已被感染。
When the rats detect the smell, they stop and rub their legs to indicate a sample is infected.
当老鼠闻到气味时，它们会停下来摩擦自己的腿，这表示样本已被感染。
When the rats detect the scent, they stop and rub their legs to indicate a sample of infected.
很长一段时间就知道，如果伴有感染的话，粪便会有特征性的不同的气味。
For a long time it has been known that stools have distinctive and different odours if there is an infection.
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