'What shall we do?' Milton said again in a toneless voice.

“我们该怎么办？”米尔顿又用平板而单调的声音问道。

柯林斯高阶英语词典

His voice was flat and toneless.

他的语气很平淡,听不出任何感情色彩.

期刊摘选

Though her voice was toneless, it plead more loudly than words.

她的声音尽管听起来很平谈, 但比大声的要求更加诚恳.

飘（部分）

His voice was flat, toneless.

他的语气很平淡, 听不出任何感情色彩.

期刊摘选

What shall we do? Milton said again in a toneless voice.

“我们该怎么办？”米尔顿又用平板而单调的声音问道。

辞典例句

"What shall we do?" Milton said again in a toneless voice.

“我们该怎么办？”米尔顿又用平板而单调的声音问道。

柯林斯例句