1. The phenomenon mainly stems from the fact that …

2. 原因accounts mainly for / are accountable for 结果

3. 原因 be responsible for 结果

4. 原因contributes partly to 结果

5. 原因 be the main/ major factor / reason/ cause

6. Another basic / primary / root reason/ cause why… is that

7. 原因cause / lead to / trigger/ bring about / result in / give rise to / generate 结果

8. 结果is due to 原因

9. 结果be in part / partly attributed to 原因

10. be a second reason/ factor; be regarded as / seen as a root cause

11. due to, owing to, because of …

12. … be the cause of … / …be the reason for… / …be the reason behind

13. … be caused by / result from / be the result of / be the consequence of

14. … affect / influence in a negative way…

15. … can be harmful/ helpful to …