This is because there are two ways of boiling liquids: one is to heat them up, breaking the weak bonds between the molecules inside.

这是由于导致液体沸腾的原因有两种：一种是通过加热破坏分子链；

youdao

The problem is that making them using somatic-cell nuclear transfer involves breaking up viable embryos, since the cells in question are found inside early-stage embryos, called blastocysts.

ECONOMIST: Human embryonic stem cells