Nowadays our short-term memories are just being underused.

如今，我期记忆有得到充分利用。

Doctors say that drug is underused.

医生说，这种药物有得到充分利用。

The third point is that governments are underusing fiscal policies in healthcare.

第三点是，政府在医疗保健方有充分利用财政政策。

He argues that short-term memory pathways will start to deteriorate from underuse if we overuse technology.

他认为，如果过度使用科技，我就无法充分使用期记忆通路，最终造成其退化。