这只狗是被收养的流浪狗。

The dog was a stray which had been adopted.

《柯林斯英汉双解大词典》

大多数被收养者对于找到自己的亲生父母有着复杂的感情。

Most adoptees have mixed feelings about finding their biological parents.

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事实上，被收养者往往很难找到他们的亲生父母，因为大多数被收养者的出生记录通常是被封存的。

As a matter of fact, it is often very difficult for adoptees to find out about their birth parents because the birth records of most adoptees are usually sealed.

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