Political philosophy exists and only exists " in that call it "zone of indeterminacy" between the "is" and the "ought " between the actual and the ideal.

政治哲学存在，且仅存于,所谓的“不确定区域“,界于“是“与“该是“之间“,即现实与理想之间。

耶鲁公开课 - 政治哲学导论课程节选

The MEPs backed Mr Coelho's call for the zone to be extended to Bulgaria and Romania.

BBC: EU warned against changing Schengen deal on borders

At the same time, they have attempted to draw the IAEA inspectors into protracted negotiations that would buy time to reach what the Israelis call the "zone of immunity" after which Israel no longer has a viable military option.

WSJ: Frederick Kagan and Maseh Zarif: America's Iranian Self-Deception

It was once believed that for the Euro Zone nations being able to call upon a large pool of domestic investors was a blessing.

FORBES: Madrid's Mighty Monetary Mess