不稳定

Several studies have shown that laminectomy increases and produces segmental instability unless fusion is performed.

背景资料：几项研究显示了椎板切除术后除了融合外，均会增加和产生节段性不稳定。

As the frontal system's much closer to North Taiwan, small-scale convection became easily to form in the Southwest area this morning as a result of the convergence of prevailing southwesterly and land breeze. Stronger convection also developed in West Taiwan this afternoon.

昨日预测今(29)日锋面系统会南移至华南，朝台湾北部接近，天气更形不稳定，预计台湾西南部清晨至上午间，盛行风与陆风辐合产生的对流云系移入而造成降雨，今日白天随锋面接近，西半部午后有较强对流发展。

In Brazil, due to the existence of landlordism at the initial stage of industrialization and the concomitant dependent-development mode, the political relationship among land-oligarchs, emerging industrial strata and social masses was unstable. As a result, the development performance and domestic political turbulence co-existed.

而巴西由于现代化初期的大地产制的存在，以及随之而生的依附性发展模式，国内土地寡头、新兴工业阶层以及社会大众之间的形成政治关系不稳定，因而发展绩效与国内政治动荡并行。

While roughly a third of US oil comes from such unstable places as Nigeria and the Middle East, rare earth metals known scientifically as lanthanides, are controlled almost exclusively by China.

尽管美国将近三分之一的石油来自奈及利亚和中东这一类不稳定的区域，可是元素名称为镧系元素的稀土金属，却几乎完全是被中国垄断了。

Now, a precarious peace has come with the 1973 cease-fire, and the Hmong, driven out of their hilltop isolation, find themselves thrust into the mainstream of Laotian life.

现在，1973的休战带来了不稳定的和平，而被从与外界隔离的山顶驱赶出来的苗族发现他们被推进了老挝的主流生活。

The attainment of sexual maturity by an organism still in its larval stage .

性爱在恋爱关系尚不稳定的初期阶段尤为强烈。

A three-level filtered spectral forecast model including orography has been developed, using the difference method, vertically, the degradation of dimensionality, and a perfect spectral method latitudinally and pseudo-spectra methods longitudinally.

文中，非线性项的处理用了变维方法，纬向的"完全的谱方法"及经向的"准谱方法"，既有利于克服非线性不稳定，且能大大节省计算量及存储量，使之能在小型计算机上实现其程序设计。

On the basis of stability analysis, the author takes the K27+825 slope from the type of slope which has lest stability as an example. According to its basic feature, the design ueses the choosed best reinforce and control scheme: lattice beam, anchor wire, grouting and abstraction of water. In the course of design, the author takes into account not only reasonable optimize of whole control plan but also local measure such as whether the unstable block will shear from vnlnerable sections when control plan is laid out concretely, in order to reach the goal of reasonable design and effective control.

在稳定性分析的基础上，以边坡稳定性最差的一类中的K27+825边坡为例，结合其自身的特点，用优选出的加固防治方案：框架梁+锚索斗灌浆+排水进行设计，设计中既考虑总体防治方案的合理优化，又充分考虑了加固工程的具体布置时是否存在不稳定体从锚索或框架梁的薄弱部位剪出的可能性等一些细部措施，以达到合理设计，有效及经济治理的目的。

For such a single-input-two-output unstable system with strong nonlinearity and strong coupling,the control scheme was accomplished by adding a tracking differentiator and the feedback control law comprised of the errors of the two controlled variables,instead of the only one in the usual ADRC scheme. This method expanded the range that the ADRC scheme can deal with.

倒立摆系统以其结构简单直观，构件参数和形状易于改变，成本低廉，而本身又是一个高阶次、不稳定、多变量、非线性、强耦合系统，被公认为自动控制理论中的典型试验设备，也是控制理论教学和科研中不可多得的典型物理模型。

A large scale of lay-off will cause society unstability.

大规模的失业会导致社会不稳定。

Objective To investigate the effects of interleukin-1 β converting enzyme gene on the biologic characteristics of ovarian cancer cells.

目的 探讨白细胞介素-1 β转换酶的表达，对卵巢癌细胞生物学特性的影响。

Campylobacter: This illness is the most commonly identified cause of diarrheal illness in the world.

弯曲：这种病是最常见的原因查明腹泻病，在世界上。