成双的

Measuring light wavelength with biprism interference is a very important experiment in the research and teaching of basic physics, the key to which is the distance measurement of the two virtual images.

用双棱镜干涉测量光波波长是基础物理研究和教学中非常重要的一个实验，该实验的关键环节是测量两虚相干光源间的距离，大多数实验教科书中大都采用二次成像法测量两虚相干光源的间距。

The other: a slender splayfoot chair of glossy cane curves, placed directly opposite the former, its frame from top to seat and from seat to base being varnished dark brown, its seat being a bright circle of white plaited rush.

与它相对的另一把细细溜溜、撇着两双八字脚的藤椅是由有光泽的曲线构成的。椅架从顶部到坐位，又从坐位到底部，整个儿都涂着暗褐色清漆，坐位则用白色灯心草鲜明地盘成圆形。

The newly developed airborne Imaging Wind and Rain Airborne Profiler, built by the Microwave Remote Sensing Laboratory at University of Massachusetts, is a dual polarized dual frequency conically scanning Doppler profiling radar.

三维风雨微波成像仪是美国麻省大学微波遥感实验室研制的双频、全极化圆锥式扫描多普勒雷达，能够同时以四种不同的入射角（30， 35， 40， 50°），15-150m的径向分辨率测量海面和气－海边缘层降雨单元的微波后向散射强度和多普勒频移。

An experiment on near threshold double ionization of helium impacted with 106 eV electron has been performed by using the newest developed reaction microscope. In this experiment the momenta of all products after double ionization of helium were measured and the five fold differential cross section was obtained for emitted electrons.

利用最新发展起来的适用于低能电子入射的反应显微成像谱仪，对电子轰击He原子近阈值的双电离过程进行了研究，实验测量了反应后4个粒子的全部动量，获得了五重微分截面及出射粒子间的关联信息。

In our research on study chemical reaction of active methylene compounds and brom-acetophenone. Because of brom-acetophenone is compound that contain carbonyl and halogen ,which will take place electrophilic substitution and nucleophilic addition. When active methylene compounds are ethyl acetoacetate and β-diketone, controlling reaction condition, we have found that mono-substitution's production and di-substitution's. production is isolated; active methylene compounds are acetoacetanilide and acetoacetanilide derivate, pyrrolidin-2-one derivants were obtained by substitution and close-ring reaction .but there is no report about it.

本文是让活泼亚甲基类化合物与溴代苯乙酮发生化学反应，由于溴代苯乙酮是含有羰基的卤代烃结构，它可以发生亲电取代和亲核加成反应，当活泼亚甲基类化合物为乙酰乙酸乙酯和β-二酮时，控制反应条件可以发生单取代和双取代两种产物；当活泼亚甲基类化合物为乙酰乙酰芳胺类化合物来反应时，溴代苯乙酮中的羰基与氨基会发生分子内的关环反应生成吡咯烷-2-酮衍生物，这在以前的研究中是没有发现的。

For example, the initial vowel of analyze becomes a shwa in analysis , and the diphthong in phone also becomes a shwa in phonetic .

例如，最初的元音的分析成为shwa的分析，和双元音的电话也成了shwa的拼音。

Exponential dichotomy describes a kind of hyperbolicity of the system. That is, the state space can be decomposed into a direct sum of two subspaces, which are continuous and invariant. And with the time evolving forward, the system is exponentially attracting in one subspace and exponentially expanding in the other subspace.

指数二分性描述了系统的一种双曲性现象：状态空间可以分解成两个连续不变的子空间的直和，随着时间的正向变化，系统在其中一个子空间上表现出指数压缩行为，而在另一个上面表现出指数扩张行为。

Gastaldi and co-workers have observed two types of contrasts in Al-Pd-Mn IQCs: black-white double-lobe and loop-shaped, by using X-ray topography, and the facetted dodecahedral pores by phase-sensitive radiography.

Gastaldi领导的小组在结合利用X射线形貌术以及相位敏感成像术研究Al-Pd-Mn二十面体准晶单晶中的缺陷时发现两种衬度，其中已知黑白双瓣衬度是由于准晶中的五角十二面体空洞引起，而对于环形衬度则除了知道退火行为不同于位错从而不太可能是位错圈外，基本上对其缺陷的几何及性质不甚了解。

The fore equipment of Chemical fiber two-for-one twister,fancy twisting machne and cover Yarn Machine make different types material into double cone shape or parallel bobbims for those machines using,and suppoying the yarn merhing function for reguar materials.

化纤倍捻机、花式捻线机、包覆纱机的前道设备，把不同规格的原料筒子络绕成可在化张倍捻机、花式捻线机、包覆纱机上加工的双锥形、平行筒子，可提供一般原料的并丝功能。

Amino resin or amino paint is mixed with a certain amount of polyisocyanate and xylene solvent etc is added.

氨基树脂或氨基漆与一定比例的多异氰酸酯固化剂混合，加入二甲苯等稀释剂不浑浊，用氨基漆与合适比例的多异氰酸酯固化剂可配成综合性能优异的双组分聚氨酯

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。