They have failed to make their people rich: despite their oil, the UN reports that about two out of five people in the Arab world live on $2 or less a day.是什么意思_They have failed to make their people rich: despite their oil, the UN reports that about two out of five people in the Arab world live on $2 or less a day.在線翻譯_英語_讀音_用法_例句