Let's keep her overnight. Put her on a fetal monitor.

让她今晚留院观察 给她戴上胎儿监护仪。

We need hearing aids. We need fetal heart rate monitors.

我们需要助听器。 我们需要胎心监护仪。

So they invented their own fetal heart rate monitor.

于是他们发明了自己的胎心监护仪。