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Measuring the focal length of concave lens using collimator;2. The relation between the focal length of a concave lens and its reflective image properties is analysed and deduced.

本文分析推导了透镜的凹面反射成像与凹透镜焦距的关系，介绍了利用此关系较方便地测量凹透镜焦距的方法。

Between the length of the esophagus and the height of the body showed a linear corelation and the length may be calculated...

发现男性随着年龄的增长门齿距齿状线间的距离长度有所延长。

Some serial ports work only if the received word length is a power of two, such as a 16-bit word length.

一些串行端口只工作在接收数据长度是2的幂时，例如16位数据长度。

To validate an investigation method for the epidemiology of Clostridium perfringens in chicken,genetic diversities of 34 strains of C.perfringens type A isolated from healthy chicken of 10 diffe-rent integrated chicken farms in Sichuan Province were analyzed by repetitive extragenic palindromic PCR and amplified fragment length polymorphism methods.

为探讨鸡产气荚膜梭菌流行现状的调查方法，采用REP-PCR(repetitive extragenic palindromic PCR)技术对四川省10个规模化鸡场分离得到的34株A型产气荚膜梭菌进行了遗传多样性分析，并与AFLP（amplified fragment length polymorphism）方法进行了分型比较。

In order to decrease total optical length, a design scheme was employed by selecting mechanically compensated zoom lens with a negative compensator, shortening the focus length of variator and compensator, and increasing the distance between front group and variator. An initial configuration was obtained by solving equations of aberrations. According to aberration theory, the aberrations were corrected by using ZEMAX optical design software.

为缩短筒长，采用负组补偿偏离物像交换变焦结构，缩短变倍补偿系统各组元焦距，增加前固定组和变倍组间距的设计方案，通过解初级像差方程求得初始结构，依据像差理论，利用ZEMAX自动设计软件进行像差校正平衡。

For a ciphered packet, regardless of the length of the packet data bytes, the RC4 has a constant latency which will generate the excessively low throughput when the packet length is too short especially.

对於要加密的一个封包，不论封包长度为多少位元组，RC4有其一固定的延迟周期，此延迟会造成过低的资料吞吐量，尤其是当封包长度愈短时。

The method of miniaturing dielectric coaxial resonators was described. The structer of step-impedance can effectively reduce the length of a dielectric coaxial resonator, each length of a step-impedance coaxial resonator is usually calculated by solving resonatant condition equation, which is complicated.

阶梯阻抗结构可以有效地降低同轴谐振器的高度，阶梯阻抗同轴谐振器的各段长度一般是通过求解谐振条件方程式来确定，计算过程整琐。

X chromosome was a large submetacentric chromosome. Y chromosome was a small metacentric chromosome.The relative length of chromosome was measured by AutoCAD software. The relative length of autosomes ranged from 1.545% to 4.921% in Yanbian yellow cattle and from 1.637% to 5.855% in Liyan hybrid cattle.

结果表明，延边黄牛和利延杂交牛二倍体染色体数目2n=60，公牛核型为2n=60，XY，母牛为2n=60，XX，其中29对常染色体均为端着丝粒染色体，X染色体为较大的亚中着丝粒染色体，Y染色体为较小的中着丝粒染色体。

For example, you could take the barometer out in a sunny day and measure the height of the barometer, the length of its shadow, and the length of the shadow of the building, and by the use of a simple proportion, determine the height of the building.

例如，你可以在一个阳光灿烂的日子里，把气压表拿出去，量一量气压表的高度和它影子的长度，再楼的影子的长度，利用简单的比例原理就能测定楼的高度了。

Then the paper has designed a set of transmission tube experiment equipment aiming at length and diameter. And based on this set of equipment, it has carried on a series of experiments to the different length and diameter transmission tube, obtained the corresponding experimental result, and then carried on the analysis with the simulation result.

同时设计了针对长度和直径参数的传压管道试验装置，利用这套装置对不同长度、直径的传压管道进行了试验，得出了相应的实验结果，并与仿真结果进行了分析比较。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。