as being 这是什么用法？

describe as 形容,把...说成
He describes himself as a doctor.
他声称自己是医生。
as是介词, 意思是"成为", 后面用动名词being. being in "正处于..."

On Tuesday, Premier Wen Jiabao sent a congratulatory message to Abe on his inauguration as prime minister and described China-Japan relations as being in an "important historical period."
周二, 温家宝总理致电安倍晋三, 祝贺他就任首相, 并形容中日关系正处于一个关键的历史时期.

一楼的关于AS的解释完全错误！

describe 在做“描述”解释时候，常用的形式是：describe .. as ...
例子：
She described her childhood as a time of wonder and
discovery.她描述她的
童年是一段充满惊奇和发现的时光

而原句中的being in an "important historical period." 是动名词做宾语！

as是“当……的时候”“但being这里并不是动名词，只因为在as后面，所以用-ing形式

同意二楼说法