It's a common bacterium and most strains of E. Coli are not harmful to people, in fact, they provide us with some beneficial properties.

它是常见菌,且大多数种类的菌株对人类无害,实际上还给了我们颇多裨益

耶鲁公开课 - 生物医学工程探索课程节选

So if you could stop a tumor from being able to develop blood vessels you might be able to stop its growth at a stage where it's not harmful.

所以,如果我们能通过阻止血管的生成,来阻止肿瘤的发展,就可以在肿瘤还处于良性阶段时扼制它

耶鲁公开课 - 生物医学工程探索课程节选

Well, i mean a cockroach might be seen as being harmful because we consider them dirty, disgusting, revolting insects and we don't define insects as something we eat, at least in our culture.

蟑螂看起来可能是有害的,因为我们觉得它脏,恶心,是令人厌恶的害虫,我们不把害虫定义为食物,至少在我们的文化中是这样的

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选