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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And all the American students of three levels were progressively more accurate when matching the third or the fourth tone than matching the first or the second tone.

而搭配声调则对初、中、高三个水平的美国学生第三声声调变异均产生影响，当搭配第三声或第四声时，学生将第三声发正确的比例大于搭配第一声或第二声的组合。

youdao

Fourth, in the color processing, should be kept simple. Peace. Calm tone.

第四，在色彩的处理上，应保持古朴。平和。沉着的基调。

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Pilot studies had shown that what might seem an obvious fourth procedure, to tone down, rather than enhance feather colour, was too damaging to work.

ECONOMIST: Male birds cannot afford to relax their standards