一直很熟悉Perfect做形容词，今天学到了它还可以做动词，做动词时，重音在第二音节上。表示：使……完美，可以和improve同义替换，但是不同的是，它更能体现一个人的决心和毅力，表示精益求精，匠人之心的意思。
1）翻译下面的句子：他是在德国读本科期间提高了自己的德语能力。
It was during his undergraduate years in Germany that he perfected his German.
2)造句：
他是在美国读研究生期间提高了自己的英语能力。
It was during his graduate years in America that he perfected his English.
3) art除过有艺术的意思，还有技能skill的意思。比如the art of public speaking, the art of acting等等。
