不稳定区，是天文学专有名词，指物质不稳定的区域。
随着间隙的增大，不稳定区和混沌响应区变宽。
It is seen that with increase in clearance the regions of unstable and chaotic response become wider.
文中将场地分为三类：稳定区、基本稳定区和不稳定区。
Site is classified into three sorts: stable region, stable region in the main and non-stable region.
研究了横摇和垂荡非线性耦合情况下的动力不稳定区问题。
Study on the instability regions of ship rolling with nonlinear coupling of heave and roll was presented.
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