The Mekong River passes through six countries as it makes its way to the South China Sea.请问上句中的as如何理解?含义?在句中的作用?

The Mekong River passes through six countries as it makes its way to the South China Sea.请问上句中的as如何理解?含义?在句中的作用?
The Mekong River passes through six countries as it makes its way to the South China Sea.
请问上句中的as如何理解?
含义?
在句中的作用?

The Mekong River passes through six countries as it makes its way to the South China Sea.请问上句中的as如何理解?含义?在句中的作用?
as是起连接两个分句的作用,意思是：当.时候、如同实际发生的那样.
当它流向南中国海时,湄公河跨6个国家.

as 在这里理解为表示“方式或者伴随”表示“在湄公河流向南海的过程中”，在句子中作引导词，引导后面的从句。呵呵