Section 4

　　主题提示：人类嗅觉的研究

　　• From previous research

　　31. the animal of monkeys

　　32. can smell tiny chemical

　　33. can easily know it is chocolate

　　34. the smell of orange in a nightclub

　　35. detect fear in the man’s sweat

　　36. Not good at finding the source of a smell

　　• Reasons why smell is important

　　37. cannot be very accurate

　　38. recall the memories of childhood best

　　39. whether we are in emotion of sad

　　40. for people good at smelling spices

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（编辑：JIE）