He is a doctor by profession and a novelist by avocation.是什么意思？

He is a doctor by profession and a novelist by avocation.

他的职业是医生,副业是作家.

he

pron. 他，它，一个人；n. 雄性动物；

例句
Logic had prevailed and he had abandoned the idea.
最终理智占了上风，他打消了那个念头。

is

vt.& vi. 是（be的三单形式；n. 存在；

例句
Bollinger 'RD' is a rare, highly prized wine.
博林格RD香槟是一种名贵的备受推崇的葡萄酒。

doctor

n. 医生，大夫，博士，神学家，医疗设备；vt.& vi. 医疗，行医；vt. 修理，装配，假造，搀杂，修改，修饰；

例句
A family doctor will be able to advise on suitable birth control.
家庭医生能够就合适的节育措施提出建议。

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

profession

n. 职业，专业，同行，宣称，信念，信仰；

例句
The profession offers a bundle of benefits, not least of which is extensive training.
这份职业提供了大量福利，全面训练就是其中很重要的一项。

and

conj. 和，与，而且，于是，然后，因此；

例句
I spend a lot on expensive jewelry and clothing...
我花很多钱购买昂贵的首饰和衣服。

novelist

n. 小说家；

例句
Faulkner has been hailed as the greatest American novelist of his generation...
福克纳被誉为他那一代人中最伟大的美国小说家。

avocation

n. <正>业余爱好，嗜好，<罕>职业；

例句
After the course is cogitative, decide development is versed in avocation machines a village.
经过深思熟虑后, 决定开发工副业加工小区.