1.
People do farming, grazing or forestry.
他们或从事农耕，或从事放牧，有的则从事林业，
2.
He embarked on a new career.
他开始从事一新事业.
3.
start or begin sth,esp a job
开始从事某事（尤指职业）
4.
Thus, when embarking on anything,
因此，我们从事任何事时，
5.
He' s worked in the cinema all his life.
他一生从事电影事业。
6.
Be engaged in legal affairs concerning foreign economic issues
从事对外经济法律事务
7.
Be concerned with
关心, 挂念,从事于
8.
start a career in (the specified profession)
开始从事（某职业）
9.
be engaged in, carry out, do research
从事、 进行、 作研究
10.
(The writer is an insurance sales representative.)
(作者从事保险业)。
11.
To engage in(a trade or occupation); work at.
从事从事（某种商业和职业）工作
12.
Now they undertake both farming and stockbreeding.
现在他们既从事农业，也从事畜牧业。
13.
They engaged in the Taoist sacrificial rites and regimen practices.
他们从事斋醮活动,从事道教养生实践。
14.
My son went in for engineering, but now is going in for teaching.
我儿子从前从事工程工作，而现在从事教学工作。
15.
These events helped to shape her future career.
这些事促成了她後来从事的事业.
16.
One who practices something, especially an occupation, a profession, or a technique.
从业者，执业者从事某事的人，尤指从事职业、专业或技术的人
17.
To versify or engage in versifying.
作诗或者从事于作诗
18.
To engage in(a war or campaign, for example).
从事于（如战争或战役）