对于医生来说，美人面颊上可爱的红晕除了是某种致命疾病的“外部症状”，难道还有别的意义吗？
What does the lovely flush in a beauty' s cheek mean to a doctor but a "break" that ripples above some deadly disease?
唯一的困难 他补充道 蚂蚁能不能飞的外部症状不明显 除非一名研究人员当场发现他们在行动。
The only difficulty, he said, is trying to identify which ants can and can't fly with no obvious outward signs -- until a researcher catches them in action.
外部使用（适当时）：只用喷在受影响部分位每天2-6次直到症状缓解。
External Use (when appropriate): Simply spray on affected areas 2 to 6 times daily until symptoms improve.
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