地壳不定稳定性的英文：
crustal instability

crustal是什么意思：
a. 地壳的

crustal attenuation
地壳变薄作用

Under the mountains these condition would call for a deficiency in density of the crustal rocks
要满足这种条件，山脉下面地壳岩石的密度应当有一个亏损。

The geodimeter measurements executed in April also disclosed very rapid and complicated horizontal crustal movements
四月份进行的光电测距仪测量也揭示水平地壳运动是非常快而复杂的。

Basin floors generated at different times will exhibit a hierarchical sequence of crustal structure and epeirogenic behaviour
不同时期生成的盆地底板，将显示地壳构造的等级次序和造陆性质。

The geological records fall into four main groups concerned with different kinds of crustal activity
地质记录根据与地壳活动有关的不同类型可以分为四个主要部分。

instability是什么意思：
n. 不稳定（性）；基础薄弱

Water may serve as a type of instability.
水可以作为不稳定性的典型代表。

Combustion instability continues to plague development efforts.
燃烧不稳定仍然阻碍研制工作的发展。

aerodynamic (passive) instability is a disadvantage for manned vehicles
气动力(被动)不稳定对于载人飞行器是不利的。

The riot can be considered a symptom of political instability.
这次暴动可看作是政治上不稳定的征兆。

That would lead to ideological confusion and political instability.
这就会造成思想混乱，导致政治的不稳定。