1、As concerns demand: the world's population is set to increase from six to nine billion in 2050.
需求方面：世界人口將從60億增加到2050年的90億。

2、As concerns the location of the proposed museum, there is no objection.
關于那個擬建的博物館館址，沒有提出什么異議。

3、As concerns him, I have nothing to say.
關于他, 我無話可說。

as concerns翻譯