He compared children who attended all-day pre-schools in Japan, where 90-minute naps are compulsory, with children of the same age who napped only when they needed to.是什么意思_He compared children who attended all-day pre-schools in Japan, where 90-minute naps are compulsory, with children of the same age who napped only when they needed to.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句