Her playing staggers sometimes although she's a good tennis player.是什么意思？

Her playing staggers sometimes although she's a good tennis player.

尽管她是一名出色的网球选手,可有时她的表现还是不够稳定.

her

pron. (she的宾格)她，(she的所有格)她的，她，指某个国家，（一艘）船；

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

playing

v. 演奏( play的现在分词 )，演出，参加比赛，捉弄；

例句
By his own admission, he is not playing well...
他自己承认表现欠佳。

staggers

v. 蹒跚( stagger的第三人称单数 )，使…感到震惊[担心]，错开，眩晕症；

例句
The whole thing staggers me.
整个事件让我震惊。

sometimes

adv. 有时，间或，时

例句
I want to work at home on a Tuesday but as it turns out sometimes it's a Wednesday or a Thursday.
我想周二在家工作，但实际上有时却是周三或是周四。

although

conj. 尽管，虽然，但是，然

例句
He was in love with her, although he did not put that name to it.
他爱着她，虽然他没有将其称为爱。

good

adj. 好的，优秀的，有益的，漂亮的，健全的；n. 好处，利益，善良，善行，好人；adv. 同well；

例句
This recipe makes a good accompaniment to ice-cream.
这道食谱适合搭配冰激凌。

tennis

n. 网球（运动）；

例句
...a tennis ball.
网球

player

n. 演员，[体]运动员，[音]演奏者，播放机；

例句
There is no comparison between the knowledge and skill of such a player and the ordinary casual participant.
临时的普通参赛者无法与这种选手所掌握的知识和技巧相提并论。