互惠原则随处可见—你是否有过这样的经历，当你离开一家商店没有买任何东西的时候，你会感觉愧疚，仅仅是因为那里的售货员不怕麻烦的帮你？
The principle of reciprocity is everywhere - have you ever felt guilty when you left a shop without buying anything, simply because the salesperson went out of his or her way to be helpful?
这自然把安全提高了一个层次：不怕麻烦的人还可以对这个仪器进行设置，只有当指纹全部满足要求时，才能显示客户的身份证号码。
That adds yet another layer of security: worrywarts can set the device to require a concerto's worth of fingerprints before it gives out the PIN code.
事务所的业务支持人员都很有能力，待人也很友好。他们不怕麻烦地来帮我在事务所里安顿下来，让我感到是他们中的一份子。
The support staff were able and friendly and went out of their way to help settle me in and make me feel at home.
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