fall between two stools

US /fɔl bɪˈtwin tu stulz/
UK /fɔl bɪˈtwin tu stulz/
"fall between two stools" picture
1.

两头落空, 两边不讨好

fail to be part of either of two categories, plans, or courses of action, but instead be in an awkward intermediate position

:
The new policy tried to please everyone but ended up falling between two stools, satisfying no one.
新政策试图取悦所有人,但最终两头落空,谁也没能满意。
If you try to specialize in too many areas, you might fall between two stools and not excel in any.
如果你试图在太多领域专业化,你可能会两头落空,在任何一个领域都无法出类拔萃。