虽然人的遗传变异会导致一些畸形，但是，许多人，包括双面畸形是由发育期间面临的障碍引起的。

While genetic mutations cause some abnormalities in humans , many , including diprosopia , are caused by obstacles faced during development .

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虽然人的遗传变异会导致一些畸形，但是，许多人，包括双面畸形是由发育期间面临的障碍引起的。

While genetic mutations cause some abnormalities in humans , many , including diprosopia , are caused by obstacles faced during development .

youdao