This painting is their joint work.

这幅画是他们合作的。

《新英汉大辞典》

Is the work (will the work be) a joint work?

作品是(或者将是)联合作品吗？

youdao

Better styling is another focus area of our joint work.

更优化的风格是我们合作的另一关键领域。

youdao

The president appealed to lawmakers from both parties to work together on health care during his recent address to a joint session of Congress.

VOA: standard.2009.09.28

You can talk about working hard on your joint problem sets, but as long as you go home and you don't work hard, it doesn't help.

你大谈特谈你在多么努力地做家庭作业,但是回家后如果你依旧偷懒,这还是无济于事

耶鲁公开课 - 博弈论课程节选

You discussed in detail your plan -- the joint work that we carry out between our nations.

WHITEHOUSE: President Obama��s Bilateral Meeting with President Nazarbayev of Kazakhstan | The White House

This recognition leads naturally to early and consistent communication among formerly separate parties throughout their joint work.

FORBES: Why Leaders Need to Rethink Teamwork

There will also be joint work on drones, mine counter-measures and satellite communications.

BBC: Cameron and Sarkozy hail UK-France defence treaties