The complaint that this is the first step on the road to "designer babies" is as weak as any other slippery-slope argument: approving one procedure does not mean automatically approving others.

将此举看作是通往“设计婴儿”之路上迈出第一步的抗议之声，也与其它那些棘手问题的辩论之声一样软弱无力：因为此法案的通过并不意味着其它法案会自动生效。

youdao

The European: There’s the slippery slope argument: Once we decide to pursue human enhancements with a certain determination, we have less control over the limits of these enhancements.

《欧洲人》：有这样一个滑坡论证：一旦我们下定决心谋求人类提升，限制提升的控制力就会被削弱。

youdao

You base this on the slippery-slope argument: selected cases may grow into casual practice over time.

ECONOMIST: Torture arguments

And there is also the slippery-slope argument: once assisted suicide is permitted for the terminally ill, vulnerable members of society, such as old people regarded as a nuisance by their families, may all too easily be pushed down it.

ECONOMIST: The case for regulated mercy-killing

As best his intentions can be made out, he seems to deploy a slippery-slope argument to the effect that once you give more than the slightest nod of acceptance to ideological or ethnic differences you are on the path to unspeakable atrocities in their name.

ECONOMIST: The morals of intervention