The presenter's monotone delivery made the quarterly sales meeting feel twice as long.

簡報者單調平板的講法，讓這場季度業務會議感覺長了一倍。

Customers complained that the support agent sounded monotone and uninterested on the phone.

顧客抱怨客服人員在電話中語氣平板，聽起來毫不在意。

Our tour guide spoke in a monotone voice, so several passengers fell asleep on the bus.

我們的導遊說話聲音很單調，所以好幾位乘客在遊覽車上睡著了。