If you don't make your choice in time, you are likely to fall between two stools.

如果你不及时作出决定, 就会两头落空.

《现代汉英综合大词典》

Again, we may make compromises and fall between two stools.

我们可能再一次采取妥协办法,但结果是两头落空.

辞典例句

The book falls between the two stools of authority and popularity.

这本书在权威性和通俗性上两头落空.

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If you go on do as that, you will fall between two stools.

如果你继续这样下去, 你将两头落空.

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