医学博士将主持明天的员工会议。

The ___M.D. will chair the staff meeting tomorrow.

他获得了医学博士学位后，现在是一名医生。

After earning his ___M.D., he is now a practicing physician.

音乐总监负责指导合唱团的排练。

The ___M.D. is in charge of directing the choir's rehearsals.