That's the thin line between success and failure.

成功与失败，只有一线之悬。

youdao

A real man knows the thin line between confident and cocky.

一个真正的男子汉会明了自信和自负的界线。

youdao

There's a thin line between companionship and support and dependency.

互相扶持仍是过分依靠，只在一念之间。

youdao

It was a place where the line between reality and unreality is extremely thin.

VOA: special.2010.10.31

There's a very thin line between the two and we therefore use the same pedagogical methods in the sense that we've got to do the following.

两者之间的差别很微妙,因此我们接下来要做的,就是采用与语言课相同方法教学

耶鲁公开课 - 聆听音乐课程节选

Addictions can wreck lives, and it seems there is a thin line between intense and vigorous play and compulsion.

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Critical thinking is important for taking on a new venture, but there can be a thin line between critical thinking and self-criticism.

FORBES: Dust Storms: Finding Our Way Home

His designs and creations run a thin line between genius and insane.

FORBES: Connect