The drawback is that wind is obviously unspecific as to where it takes the pollen.
节选自一篇题为Wind pollination的文章
问题如下：
1、“as to where it takes the pollen”是做的wind的定语吗？
2、可以把“as to where it takes the pollen”用另外一种方法“as it takes the pollen to the place”表达吗？这里的as是什么词性，什么含义，干什么成分呢？
先把句子翻译出来：
The drawback is that wind is obviously unspecific as to where it takes the pollen.
【翻译】缺点是，风至于把花粉带到什么地方显然是没办法确定的。
as to 是个“复合介词”，意思是“至于，关于；就……而言”。介词后面接 wh- 引导的名词性从句是正常状态。又如：
He is in no doubt as to what is needed.
他非常确定需要什么。
来自柯林斯例句
Theres some question as to whether he will sign this resolution.
他会不会签署这项决议还不可以确定。
来自柯林斯例句
Jackie and Ben came to a joint decision as to where they would live.
关于他们将住哪儿是杰姬和本一同决定的。
《柯林斯高阶英汉双解学习词典》
网友可以查一查 as to 的使用方法，非常容易见到。
