Air resistance then causes these crystals to lie nearly flat much of the time as they flutter to the ground.
而当它们飞舞着接近地面的时候，因为空气阻力的原因，它们会在空中水平漂浮很长时间。
As these crystals flutter to the ground, much time is spent with their faces flat, parallel to the ground.
这些冰晶缓缓地飘向地面，大多数时候是面向地面并与地面平行的。
The next time you see a butterfly flutter by, take a moment to notice the colors on its wings.
当你再次看到一只蝴蝶翩翩飞舞时，稍微留意一下它翅膀的颜色。
Furthermore, it performed the parametric analysis in terms of feedback gains and delayed time using the root locus method, thus obtaining the system's flutter stability boundary.
进而采用根轨迹方法就反馈增益和延迟时间进行参数分析，获得系统的颤振稳定性边界。
Design of flutter model from aircraft metal structure to composite structure can be achieved by equation of stiffness, yet it may cost much time for general design method.
金属飞机结构到复合材料结构的颤振模型设计，要求采用刚度等代法来完成，然而一般的设计方法通常需要消耗大量时间。
The time histories of structure responses of airfoil are solved by coupled with the Navier Stokes equations and flutter moving equations with nonlinear structural stiffness functions.
计算结果表明，结构刚度非线性对颤振特性有明显的影响。
According to the principles and signal properties of flutter test, a new filtering algorithm in time-frequency domain is presented.
根据颤振试验的原理和观测信号特点，提出一种时频域滤波方法。
Air resistance causes these crystals to lie nearly flat much of the time as they flutter to the ground.
在这些冰晶飘落到地面的过程中，空气的阻力使得它们大部分时间保持近似扁平状。
According to the demand of wind-resistance analysis for the Bridges, a full set of practical method of flutter time analysis is brought forward for cable-stayed Bridges.
根据桥梁抗风计算的需要，提出了一整套斜拉桥抖振时域分析的实用方法。
Simulation of stochastic wind velocity field is prerequisite to flutter or buffeting analysis of long-span bridges in time-domain.
随机脉动风场的模拟是大跨度桥梁颤抖振时域分析的前提。
At the same time, the substantiating test techniques have been described, especially the analog simulation test technique, sub-critical flutter test, closed-loop test, etc.
同时，还介绍了几种试验验证技术，主要是模拟仿真试验技术、亚临界颤振试验、闭环系统试验等。
At the same time, the substantiating test techniques have been described, especially the analog simulation test technique, sub-critical flutter test, closed-loop test, etc.
同时，还介绍了几种试验验证技术，主要是模拟仿真试验技术、亚临界颤振试验、闭环系统试验等。
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