他接着说，“这种酶对人类和动物没有伤害，而且对环境是友好的。”
He went on, "The enzyme is not harmful to humans or animals, and it is friendly to the environment."
这些对人友好的动物成了杰夫从未有过的朋友，他开始日思夜想去探访他们。
The outgoing animals quickly became the friends Jeff had never had, and he began to live for these visits.
研究发现，犬齿不喜欢看到他们的主人对别的动物尤其是别的狗表示友好，当主人带回新的宠物，它们则反应消极。
Canines do not like seeing their owners offering affection to other creatures, especially other dogs, and react negatively when their owners bring home new partners, the research found.
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