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?
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？
Without anything left in the cupboard, she went out to get something to eat.
看到食橱里没有剩下的食物，她就出去找吃的了。
Without anything left in the cupboard, she went out to get something to eat.
看到食橱里没有剩下的食物，她就出去找吃的了。
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