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