'So you told her?' he said in a neutral tone of voice.

“那么你告诉她了？”他平静地说。

《牛津词典》

The tones include the first, second, third, and the fourth tones and the neutral tone.

声调包括第一、第二、第三、第四声和轻声。

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There are four tones in Mandarin Chinese Pinyin, plus one neutral tone(or called "no tone").

在汉语中有四个声调，加一轻声（或称为“无音”）音。

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