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 …