It could be the letter understood either graphically or audibly, and the variety of ways in which one can choose a basic unit in the study of linguistics means that you need a special word for that unit, which is characteristically "the tagmeme."

它既可以以图像的方式理解，也可以以声音的方式，因为每个人研究时选取的,基本的语言学单位不一样,所以需要一个特殊的名词来指代这个单位，这就是，法位“

耶鲁公开课 - 文学理论导论课程节选

In the public gallery, a small coterie of chaps in striped jumpers and black masks groaned, audibly.

BBC: Back on the beat

So as workers forego their privacy, audibly and visibly, how can they get any work done, let alone increase their productivity?

FORBES: Open Workspaces Are Here to Stay. Now, How Do We Get Any Work Done?

As Gore's vehicle approached, White House staff busily and audibly alerted the traveling press corps that Gore was about to meet Clinton.

CNN: Both sides deny existence of rift