She was a medical practitioner before she entered politics.是什么意思？

She was a medical practitioner before she entered politics.

从政前她是个开业医生.

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。

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。

medical

adj. 医学的，医药的，医疗的，内科的；n. 体格检查；

例句
...a Code of Practice that would give patients right of access to their medical records.
允许病人查看自己病历的职业准则

practitioner

n. 从业者，执业医生，习艺者，专门人才；

例句
She was a medical practitioner before she entered politics.
从政前她是个开业医生.

before

prep. 在…之前，先于，优于，当着…的面，与其…；conj. 在…之前，在…以前，比…早些，与其…；adv. 先前，从前，在前，在前方；

例句
He pleaded guilty before a court martial to absenting himself without leave.
在军事法庭上他对自己擅离职守表示服罪。

entered

v. 进入( enter的过去式和过去分词 )，进去，参加，登记；

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

politics

n. 政治，政治事务，政治观点，权术；

例句
He had discovered politics and was rapidly becoming absorbed by it...
他接触到了政治并且迅速地对它着了迷。