她和她的嫂子联手开了一家餐厅。

She ___joined ___forces with her sister-in-law to set up a restaurant.

第二个提议是我们与绿色和平组织联手在炼油厂外抗议，这当然取决于个别成员。

The second proposal is that we ___join ___forces with Green Peace in picketing the refinery, this of course is up to the individual members.

两家公司决定联手开发新技术。

The two companies decided to ___join ___forces to develop new technology.