Kevin constantly changed his pattern, and Weily looked like he was having the time of his life. "The first requirement for a good sniffer dog is for him to be passionate about a thing. This thing can be a certain food, toy or even a towel.
「好的偵測犬的第一個條件是要對某個東西有狂熱的喜愛，這東西可能是某種食物、玩具或只是一捆毛巾，而威利最喜歡的就是球。」