The calotype was revolutionary in its use of chemically treated paper in which areas hit by light became dark in tone, producing a negative image.

卡罗摄影法对化学处理纸的使用是革命性的，其中光照区域色调变暗，形成负像。

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The word “dissatisfaction” has a very negative tone, but I would like to point out that dissatisfaction does not necessarily create unhappiness.

“不满”一词带有非常消极的语气，但我要指出的是，“不满”和“不快乐”没有必然的联系。

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Some gestures project a very positive message, while others do nothing but set a negative tone.

有些姿势是非常积极的信息，另外的什么也不干却树立了消极的音调。

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But Enzi adopted a negative tone when he gave the Republican response to one of President Obama's recent weekly radio addresses.

VOA: standard.2009.09.04

In response, Ethiopia's foreign ministry called the ICG report 'malicious propaganda' that contains extremely serious errors and takes an entirely negative tone toward government policies'.

VOA: standard.2009.11.01

Some market watchers had expected this sector to bottom out today, but the overall market tone was negative and the telecom equipment makers could not resist the downward tide.

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Ryan Basilio of Los Angeles, California, was discouraged by the overall negative tone of the debate.

CNN: Strong start but no win for McCain, iReporters say

But this technology clearly offers much more positive than the negative tone of this article.

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