Audacity: Silence the selection of the sound track 將選取的一段音軌靜音

This is a function of Audacity.

To mute a selection in Audacity, simply click the button for 'Silence audio selection'.

Result:

Related Information:

Audacity: Change audio speed and keep the pitch of the talker unchanged (StudyEECC)

Audacity: Change the sample rate from 44.1 kHz to 16 kHz (StudyEECC)