Well, the main activities in the region were historically steel and paper processing, I think.
我想，该地区过去的主要活动是钢铁和造纸加工。
The main activities in the region were historically steel and paper processing.
该地区过去的主要产业是钢铁工业和造纸加工。
To simplify the development process, we will divide the process into three main activities
为了简化开发过程，我们将此过程分为三项主要工作
To simplify the development process, we will divide the process into three main activities
为了简化开发过程，我们将此过程分为三项主要工作
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