I was greatly impressed by the handiness with which she played the piano.是什么意思？

I was greatly impressed by the handiness with which she played the piano.

她弹奏钢琴如此娴熟,给我留下了深刻印象.

was

v. 用来表示某人或某物即主语本身，用来表示某人或某物属于某一群体或有某种性质（ be的过去式 ），在，存在，不受干扰；

例句
There was a terrible sadness in her eyes...
她眼神中流露出深深的悲伤。

greatly

adv. 大大地，非常；

例句
Any assistance you could give the police will be greatly appreciated...
您提供的任何帮助警方都将万分感谢。

impressed

adj. 印象深刻的；v. 使感动，使印象深刻( impress的过去式和过去分词)；

例句
I'm not impressed by the promise of tax cuts against the backcloth of a public-spending deficit.
在公共开支出现赤字的情况下承诺减税让我不以为然。

by

prep. 在…旁边，表示方式，由于，经过；adv. 经过，表示保留或保存时用，短暂拜访；

例句
...expensive make-up that we saw being advertised by a beautiful model...
我们所见的由一位漂亮模特代言的昂贵化妆品

the

art. 指已提到的人（物），指说话人与听者已知的人（物），用于独一无二的事物前，与形容词最高级和序数词连用；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

handiness

n. 巧妙，轻便，敏捷；

例句
I was greatly impressed by the handiness with which she played the piano.
她弹奏钢琴如此娴熟,给我留下了深刻印象.

with

prep. 和，跟，随着，关于，和…一致；

例句
A waiter entered with a tray...
侍者端着托盘进来了。

which

pron. 哪一个，哪一些，哪个，那，指前面提到的事物；adj. 哪一个，哪一些；

例句
...the latest date at which a foetus can be aborted.
能够打胎的最迟日期

she

pron. 她，它；

例句
Her lover walked out on her after she had aborted their child.
她的情人在她打掉胎儿后甩了她。

played

v. 演奏( play的过去式和过去分词 )，演出，参加比赛，捉弄；

例句
The band played the Czech anthem.
乐队演奏了捷克国歌。

piano

n. 钢琴，<美俚>囚犯工作席，轻奏乐段；

例句
He sang 'My Funny Valentine' to a piano accompaniment.
他在钢琴的伴奏下演唱了《我可爱的情人》。