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He replied in a toneless mechanical voice .

他以平板而机械的声调回答。

Implementation and improvement of toneless input method for taiwanese .

台语无声调输入法的实作及改良。

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。

So is that what you bought me for my birthday ? Says my eight-year-old son in a toneless voice , plainly unimpressed .

那就是你买给我的生日礼物吗？我8岁的儿子对此不悄一顾并用一种淡漠的语气说道。

I dislike the black clothing that my sister bought for me . I really don 't like the toneless colors .

不喜欢姐姐帮我买的那些黑色衣服，我真的不喜欢沉闷的色彩。