To argue for a cause-and-effect relationship, scientists must attempt to explain why and how a connection could occur.
想要证明因果关系，科学家们必须尽量解释这种联系可能出现的原因和方式。
These stories are full of compassion and courage and explain why and how, ordinary people can make a difference.
这些故事充满了同情和勇气，并说明普通人为什么和如何能发挥作用。
These stories are full of compassion and courage and explain why and how, ordinary people can make a difference.
这些故事充满了同情和勇气，并说明普通人为什么和如何能发挥作用。
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