There are many possible reasons why Nanshan Group has been recruiting people. The following are some possible explanations:

1. The company's business scale expands: Nanshan Group may need to add personnel to meet growing business needs due to business expansion or market growth. As your company grows, hiring new employees is an important step in keeping the company running smoothly.

2. High staff turnover and turnover rate: If Nanshan Group has high staff turnover and turnover rate, the company will need to recruit to fill these vacant positions. High turnover rates may be caused by employees pursuing better career opportunities or by instability in the company.

3. Changes in skill requirements: Nanshan Group may need to recruit employees with specific skills or professional knowledge to cope with changes in business. For example, if a company plans to expand in an emerging field, they may need to recruit talents in related expertise.

4. Human resources planning and optimization: Recruiting can also be part of Nanshan Group’s strategic planning. Companies may believe that increasing the number of employees or forming diverse teams will increase overall productivity and innovation.

It should be noted that the above are just some possible explanations, and the specific reasons may vary depending on the company's strategy, business conditions, market conditions and other factors. If you want to know more deeply, it is recommended to contact Nanshan Group’s human resources department or recruitment department for a more accurate explanation.