查询词典 key-stone

The key to feature extraction is to select the optimal feature combination from all the features. In this study, the optimal color feature combination,{/G,(R+4G+B)/6, H variance, S variance}, is selected using genetic neural network at first. Then the main texture features including the mean, variance, energy and entropy of the cooccurrence matrix, the secondary texture features including the maximum frequency number, absolute uniform, inertia and importance of the co-occurrence matrix are extracted.

在此基础上，提出适合多阈值和小目标图像分割的免疫遗传图像分割方法，该方法借鉴了生物免疫系统自调节、抗原识别和记忆功能，并结合了遗传算法对图像进行自适应区域的阈值分割，改善了遗传算法优化复杂问题时存在收敛速度慢和易陷于局部最优的不足，克服了传统阈值分割方法对目标大小的限制，是一种新型的有效的图像分割方法。

New US research indicates that the absolute humidity, which measures the amount of water present in the air, is the key to reducing the spread of flu.

美国最新研究表明，空气绝对湿度与流感病毒的传播有密切关系。

In the second chapter, we investigate propagations of desynchronous disturbances in synchronized chaotic one-way coupled map lattices. It is well known that spatiotemporally chaotic systems with large gradient couplings may show convective instability under the absolute stability condition of chaos synchronization. This convective instability is the key reason for the effective propagation of control signals.

时空混沌在不同的耦合系数情况下会表现出不同的动力学行为，用驱动实现具有强梯度耦合系数的时空混沌同步时，会观察到在绝对稳定条件下被驱动系统表现出对流不稳定性，这种对流不稳定性是在单个信号驱动下实现混沌同步的关键原因。

However, operating of the high current, the output power, gain, and efficiency of gyro-TWT will be degraded where the absolute instability, gyrotron backward oscillation and reflective oscillation occur to cause mode competition. Stability issues comprise the key factors limiting the performance of the gyro-TWT.

对於高电流的影响，磁旋行波放大器将有可能引发绝对不稳定、磁旋返波振荡(gyrotron backward oscillation；gyro-BWO)及反射振荡，造成模式竞争而抑制原先操作模式的放大波，进而影响其输出功率、增益及效率。

However, operating of the high current, the output power, gain, and efficiency of gyro-TWT will be degraded where the absolute instability, gyrotron backward oscillation and reflective oscillation occur to cause mode competition. Stability issues comprise the key factors limiting the performance of the gyro-TWT, therefore physical origins of spontaneous oscillations in the gyro-TWT are analyzed and characterized.

然而受限於操作高电流，磁旋行波放大器可能引发绝对不稳定性、磁旋返波振荡(gyrotron backward oscillation；gyro-BWO)及反射振荡，造成模式竞争而抑制原先操作模式的放大波，进而影响其输出功率、增益及效率。

Key Concepts: rise of piano, standardisation of the orchestra, sonata form, chamber music, symphony, balance, enlightenment, absolute music ,concerto, homophonic.

主要音乐概念：钢琴地位的提升，管弦乐队的标准编制，奏鸣曲式，室内乐，交响乐，音乐平衡感，音乐教化作用，纯音乐，协奏曲，主调音乐。

Key concepts: rise of piano, stardisation of the chestra, sonata fm, chamber music, symphony, balance, enlightenment, absolute music ,concerto, homophonic.

主要音乐概念：钢琴地位的提升，管弦乐队的标准编制，奏鸣曲式，室内乐，交响乐，音乐平衡感，音乐教化作用，纯音乐，协奏曲，主调音乐。

Presently, the key problem about the scope of Chinese government officials is not oversized in an absolute term, but the irrationality in ratio, structure, and the "operational super-abound".

中国在政府官员规模方面的主要问题不是绝对规模过大，而是比例、结构不合理和"运行性过剩"。

This is one of the key stuff I''ve be absorbing.

这也是我领悟到的关键之一。

At the stage of seed germination, water absorption was the key factor that determined whether the seeds did or did not sprout.

由于pH值、缓冲量等代表碱度的指标与水势没有直接关系，所以对星星草种子萌动阶段没有决定性影响。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐