1. The phenomenon mainly stems from the fact that …
2. 原因accounts mainly for / are accountable for 結果
3. 原因 be responsible for 結果
4. 原因contributes partly to 結果
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 結果
8. 結果is due to 原因
9. 結果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 …
