医生诊断她患了单核细胞增多症，需要休息两周。

The doctor diagnosed her with ___mono and said she needed two weeks of rest.

这张老唱片是单声道的，没有立体声效果。

This vintage record is in ___mono, lacking stereo effects.

他喜欢用单声道录音，因为听起来更清晰。

He prefers recording in ___mono sound as it sounds clearer.