兼任的英文：
hold two jobs at once
(adj) part-time

参考例句：

The Prime Minister doubles as Minister of Finance.
总理兼任财政部长。

Dual executive director: Executive director of both the World Bank and the International Monetary Fund.
兼任执行董事:同时担任世界银行和国际货币基金组织的执行董事。

The Prime Minister doubles as Minister of Foreign affairs
总理兼任外交部长。

He doubled as coach and captain of the team.
他兼任教练和队长。

Does the head of Quality Control function in any other capacity?
质量控制负责人还兼任其它职位吗？

The announcer doubled in brass as the station's music librarian.
这位播音员还兼任之声乐器保管员。

Six John serves on the boards of several companies.
约翰爵士兼任好几家公司的董事。

The incompatible offices of prosecutor and judge.
检察官和法官的职位不能由一个人兼任

hold是什么意思：
n. 控制；握住；保留
v. 拿住，握住；保留；保持不变，持续；约束，控制；拘留；容纳；持有；适用

nail down; nail in;hold by
钉住;使人遵守诺言

We hold on in spite of the storm
我们冒着暴风雨继续前进。

hold a fair to raise money
举办义卖会筹款

two是什么意思：
num. 二，两个
n. 两个人
adj. 两个的

Knit two, purl two.
两针朝下，两针朝上。

the better of the two
两者中的更好者

What does two and two make?
2加2等于几？

jobs是什么意思：
n. 工作，零活
v. 做零工，打杂

You are not qualified for this job.
你不适合这份工作。

That is a job and a half.
那是非常困难的工作。

To assign a peripheral to a job for the duration of the job.
把一个外围设备在作业期间内指定给一个作业使用。