because they leave messages in a few special places. 因为他们会在几个特殊地点给对方留下信息

278. They live solitary lives.
     雪豹是独居动物
279. Nonetheless, they are well aware of the presence
     尽管如此 他们仍能很好地掌握
280. and the movements of their neighbours,
     邻居们的存在和动向
281. because they leave messages in a few special places.
     因为他们会在几个特殊地点给对方留下信息
282. They rub particular rocks with their cheeks
     像这样用脸颊摩擦特定的岩石
283. and then spray them with urine.
     再喷射上自己的尿液
284. The two perfumes create a unique signature.
     两种味道创造出了独一无二的签名

来自《行星地球 第二季 第二集 Planet Earth S02E02 山脉》第 281 行