现在正要进入一阵不稳定的气流，请系上安全带。
We are now passing through some turbulence. Please fasten your seat belts.
凯西：糟了。我讨厌不稳定的气流！
气流分级机分级粒径的不稳定是造成精度下降的根本原因。
The precision of cut of air classifier is decreased by the flunctuation of cut-size.
对流层低层南风气流的加强，可影响对流层中层的暖湿程度减弱，从而加强了对流层低-中层内的对流性不稳定。
The wet and warm degree in middle troposphere is weakened and the convective instability in lower middle troposphere is strengthened by increasing wind speed of southern flow.
本文采用与时间有关的线性微扰理论，分别讨论了旋转气流、纵向气流的作用，以及它们共同的作用下电弧螺旋不稳定性的特征。
The linear time perturbation theory is used in this paper, the effects of rotary flow, axial flow and both of them to the arc stability are discussed respectively.
对于这个月月平均基本气流，进行正压不稳定度判据的检定，发现存在接近正压不稳定的条件。
The monthly averaged basic air current was approximately the barotropic instable condition which was measured by the meridional gradient of absolute vorticity.
各位旅客请注意，我们正遇到不稳定的气流，飞机有些颠簸，请您回到座位上并系好安全带。
Ladies and gentlemen, we are now encountering some turbulence. Please return to your seats and fasten your seat belt.
稳定的空气，如果空气不稳定，气流会从山顶而不是侧面吹向山后并砸落地面，这时背风面存在强烈的下降乱流。
The stability of the air. If the air is unstable, the air may flow over the top of the hill instead of round the side, meaning that it will come crashing down in an area of sink behind the hill.
低涡切变线、西南风低空急流、东风气流和地面倒槽是本次暴雨的主要影响系统，该地区维持高能，饱和，位势不稳定的小环境，有利于特大暴雨的产生和维持。
The following conclusions can be drawn. 1. The main influence systems of causing this heavy rainfall are southwest vortex, shear line and southwest low-level jet.
采用计算横波型扰动波谱和谱函数的方法，研究了当基本气流具有垂直线性切变、层结参数为常值时横波型扰动的不稳定，给出了不稳定扰动的结构，讨论了不稳定的性质。
The character and structure of instability of transversal wave disturbance is studied in this paper by using calculating the spectrum and spectral function of the transversal wave disturbance.
采用计算横波型扰动波谱和谱函数的方法，研究了当基本气流具有垂直线性切变、层结参数为常值时横波型扰动的不稳定，给出了不稳定扰动的结构，讨论了不稳定的性质。
The character and structure of instability of transversal wave disturbance is studied in this paper by using calculating the spectrum and spectral function of the transversal wave disturbance.
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