By around age three, George has ceased using null subjects, and has the following proportions for overt subject use: he uses full NP subjects 25% of the time, and pronominal subjects 75% of the time.是什么意思_By around age three, George has ceased using null subjects, and has the following proportions for overt subject use: he uses full NP subjects 25% of the time, and pronominal subjects 75% of the time.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句