There was an echo on the line and I couldn't hear clearly.

电话里有回音，我听不清楚。

《牛津词典》

I can't hear clearly. Please turn down the radio a little.

我听不清楚。请把收音机关小声一点。

youdao

Her eyesight and hearing are so poor that she can't see or hear clearly.

她的视力和听力很差，看不清也听不清。

youdao

Then you have to shape it into a structure that people can hear clearly.

FORBES: The Two Secrets For Giving A TED Speech That Lasts

It is a message I hear very clearly throughout my travels.

WHITEHOUSE: Office of Science and Technology Policy Blog

After nearly four years of listening, we can now hear more clearly where the U.S. stands in the estimation of that world: equally despised but considerably less feared.

WSJ: Stephens: Muslims, Mormons and Liberals