Adoptees Birth的意思|示意

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.

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。

Not only that, but studies of twins and adoptees have shown that about 50 percent of each person's happiness is determined from birth.

不仅如此，对双胞胎和被领养者的研究结果也表明，每个人的幸福感水平都有一半左右是生就的。