perfect
to make something as good as you are able to
例句: Jiro Ono, arguably the best living Japanese sushi chef, has devoted his entire life to perfecting the art of sushi.
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。
He perfected his German during his undergraduate years in Germany.
参考翻译：It was during his undergraduate years in Germany that he perfected his German.
2）场景：他一有机会就在提高自己的口语能力。
造句：He has taken every opportunity to perfect his speaking skill.
