Another reason why .....(凑字数，但不可滥用) is that....(有利于写长句)
What is also worth noticing is that....
There is another factor that deserves some words here.
A more essential factor why.... Is that
A further reason why,,,, is that.....
Moving on to wider themes,_______
The second thing that must be taken into consideration is that...
Likewise(同样), common sense tells us that...
The third but very important reason is that...
The third, not the last is that,
The last factor to be taken seriously is...
Finally, moreover, last but not least, furthermore.
As the proverb goes: "every coin has its two sides", ....is no exception.