这项工作由专人负责。

Someone is put in charge of the work.

这件事要由专人负责。

A person should be specially assigned for this job.

人口方案负责专家会议

Population Programme Heads Experts Meeting

安装负责人(由制造厂派出的)

шеф-монтёр (шефмонтёр)

实行集体领导和个人分工负责制相结合的制度

function on the principle of combining collective leadership with individual responsibility based on division of labour