英语用法提问First,and most importantly 这种用法正确吗?需要在most之前加the吗?

First,
and most importantly
例句:
First,and most importantly,any
exchange of old
for new debt
must retain identical face value,they
should be "par
bonds."
首先,也是最重要的,任何新旧债务之间的兑换,都必须保留同样的面值,它们应当是“等值债券”.
所以,没有问题.