1.骑墙派
1.somebody who is unwilling or unable to choose between sides
1.But she's such a fence sitter on the important issues!
可是她在一些重要的问题上没有立场!
2.That man has managed to stay in office for ten years by being a regular fence-sitter.
那个人在办公室管理待十年是因为它是一个标准的骑墙派。