1. And I would like to present two explanations for this.

对于此，我有如下两点解释。

2. The reasons are chiefly as follows.

主要原因如下。

3. There are numerous reasons why ...，and I would like to explore a few of the important ones here.

为什么会…的原因很多，在此列举几项较为重要的原因。

4. The reasons are presented below.

原因如下。

5. This is based on the propensity of following points.

基于以下的原因。

6. The main reason is that ...

主要原因是…

7. One very important argument for ... is that ...

…非常重要的原因便是…

8. The reasons are quite clear. Above all ...

原因非常消楚。首先…

9. The first reason can be seen by every person.

第一个原因其实很明显。

10. Another reason why ... is that ...

…的另一个原因是…

11. What is also worth noticing is that ...

值得一提的是…

12. There is another factor that deserves some words here.

还有另外一个很重要的原因。

13. A more essential factor why ... is that ...

…的更为重要的原因是…

14. A further reason why ... is that ...

…更深层次的原因是…

15. In addition

此外，再者

16. Moving on to wider themes, ...

展开来说, …

17. The second thing that must be taken into consideration is that...

第二个原因也很重要（值得考虑），即…

18. Likewise, common sense tells us that ...

同样，…是众所周知的。

19. The third but very important reason is ...

第三个非常重要的原因是…

20. Moreover furthermore...

此外，…