to be in the midst of doing sth

• 正在做某事

to be in the midst of doing sth的用法和样例：

例句

1. That's what the kids in the photo are doing when they do the hula, a traditional dance of Hawaii.
   那就是照片中的小孩正在做的事，他们正在跳草裙舞，即夏威夷的传统舞蹈。