re.quired
required的音标和读音:DJ音标发音: [riˈkwaird]KK音标发音: [rɪˈkwaɪrd]
required的词性:adj.Abbr. req, reqd(形容词)缩写 req, reqd
1. Needed; essential.必需的;必不可少的
2. Obligatory:必要的:
required reading.必读物