通常患犬没有明显症状，仅有心脏杂音。
There usually are no signs in dogs except for a heart murmur.
由于通常情况下，鹿并没有明显症状，被猎人打死的鹿被感染的机会将近乎随机。
Since the deer generally do not have obvious symptoms, hunter-killed deer would have close to a random chance of being infected.
大部分前驱糖尿病患者都没有明显症状，但他们被认为有极高的心脏病发病风险。
Most people with prediabetes don't have symptoms, but they are considered to be at high risk of developing heart disease.
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