In the unites states, when you speak of upper, middle and lower classes you speak of not of national origin or ethnicity but of power and control over material resources.是什么意思_In the unites states, when you speak of upper, middle and lower classes you speak of not of national origin or ethnicity but of power and control over material resources.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句