v. (使某物[人])堅(jiān)韌, 堅(jiān)強(qiáng), 強(qiáng)硬( toughen的現(xiàn)在分詞 )
??? 情景例句
So good to see you all!
看到你們大家真高興!
Learn to creep before you leap.
循序漸進(jìn)。
is as the proportion of the total vocabulary of his mother tongue against those words of his own baby talk that are taken up into the vernacular of his family.