几天前，我带牠去看了一下兽医，知道牠需要动动小手术来根治牠的毛病。
I took him to the veterinarian a few days ago and learned that he needs some minor surgery to fix the problem.
昨天我去看他，却发现他已于几天前出国了。
I went to see him yesterday, only to find that he had gone abroad several days before.
昨天我去看他，却发现他已于几天前出国了。
I went to see him yesterday, only to find that he had gone abroad several days before.
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