名词
中文翻译：非正式的费率
同义词：
['non-official rate', 'unofficial rate', 'informal rate']
例句：
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1. The company's decision to raise the prices is unofficial and subject to change.
该公司决定提高价格的决定是非正式的，可能会改变。
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2. The unofficial rate of inflation has been a concern for many economists.
非官方的通货膨胀率一直是许多经济学家关注的问题。
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3. The government has announced an unofficial rate for fuel consumption.
政府已经宣布了一个燃料消耗的非正式速率。