四年前，她在北京动物园的一个小笼子里发现了一只孤独的水獭，这让她十分难过。
It made her sad to find a solitary otter in a small cage at Beijing Zoo four years ago.
你会为一只没花你一分钱的小驴感到难过吗？
Do you feel so sorry for a little donkey that has cost you nothing?
我听了他的话心里有点难过，只怨自己太粗心大意了。
I was rather saddened by what he had said and regretted my own carelessness.
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