他转过身来，发现朋友正站在身后。

He ___turned around and saw his friend standing behind him.

公司通过改进产品设计成功扭转了销售下滑的局面。

The company ___turned around the declining sales by improving product designs.

快递公司在一小时内高效处理了所有包裹。

The courier service ___turned around all the packages efficiently within an hour.