双

After consulting relevant materials, 58 endemic species of Chinese freshwater bivalves belonging to 17 genera in 2 families were systematically sorted out, most of which belong to the family Unionidae (57 species, 16 genera).

通过查阅有关文献整理得出，中国淡水双壳类特有种计有58种，隶属于双壳纲2科17属，其中主要是蚌科的种类（16属57种）。

The mantle cavity is lateral and in most bivalves, the gills have a respiratory and digestive function.

双壳贝的外壳是由外套膜分泌而来，套膜包覆著内脏，在多数双壳贝中，外套腔多位於两侧，鳃具有呼吸和消化的功能。

When compared with TL Buck converter, efficiency of this new converter is higher and the DC voltage blocking capacitor[1] can be smaller, when compared with double frequency Buck converter, voltage stress of the high frequency switches is lower, the output capacitor and inductor is smaller, and the dynamic load characteristic is better.

与三电平Buck变换器相比，复合双频Buck变换器具有较高的效率，而且其"隔直"电容可以取得更小。与双频Buck变换器相比，其具有高频开关电压应力低，输出滤波电感、滤波电容小，动态负载性能好等优点。

This sheepskin bootie is breathable and features a sturdy, double-stitched construction and a supportive dual-EVA sole.

这是羊皮布蒂透气，并具有坚固，双缝施工和支持双EVA鞋底。

Based on the asymptotic homogenization theory, the periodic boundary conditions for the unit cell were established by using the ANSYS parametric design language. The problem of the unit cell was solved by finite element method and the effective elasto-plastic properties of dual phase steels were obtained.

在渐近均匀化方法基础上，假设双相钢的结构为周期排列，通过ANSYS参数设计语言建立周期性边界条件，用ANSYS有限元程序对3种平面应变模型的单胞进行求解，得到双相钢的有效弹塑性性能，并与其他计算结果进行比较。

We propose a kind of 3D eddy current boundary value problems in the form of two component vector potential and approve the validity the potential in some situations.

本文提出三维涡流场的双分量向量位形式的边值问题，并证明了双分量向量位在一定条件下的适用性。

Three and eleven she paid for those stockings in Sparrow's of George's street on the Tuesday, no the Monday before Easter and there wasn't a brack on them and that was what he was looking at, transparent, and not at her insignificant ones that had neither shape nor form the cheek of her!

她在乔治街的斯帕罗商店花三先令十一便士买下了这双长袜。那是星期二，不——是复活节前的星期一。他定睛望着的正是这双连一根线也没绽的透明袜子，而不是西茜那双毫无可取、一点样儿也没有的袜子

Without using Lie derivative and Lie bracket operation of differential geometry , we only use the algebra method to give a sufficient condition of single input exact feedback linearizable bilinear systems.

摘 要 研究了单输入的双线性系统的精确线性化及其鲁棒控制器设计问题，避免了用微分几何的李导数、李括号的复杂运算，只用纯代数的方法给出了一般单输入双线性系统精确线性化的充分条件。

"A little meat, some bread rolls, and things for the household," she said.

她说。然后又问女仆，女仆要一双拖鞋和几双绣花的长袜子。

Two specieses, Lycoris radiate and Lycoris aurea, were selected for the studying of artificial propagation in vitro. A few specieses of Lycoris, from the southeast area of China and part of locations in Japan, were chosen to research their karyotype differentiation and to measure their genetic diversity by ISSR analysis. The results could be summarized as follows.1. The vegetative propagation conditions of Lycoris aurea and L. radiate in vitro was studied by two-scaling. Different illuminate condition had an effect on the bulblet formation rate. To the species of L. radiate, the rate was higher in the state of 16h 800-12001x illumination than in the darkness. The medium also affected the new bulblet formating rate. When the culture was MS medium 0.2 mg/L NAA 4 mg/L 6-BA, the bulblet formationg rate of L. aurea was 220%;at the same time, when the medium was MS 0.2 mg/L NAA 2 mg/L 6-BA, the rate of L.

本研究选择西南部分地区及日本的几个石蒜品种，从细胞学和DNA分子角度，分析了它们的遗传多样性水平和遗传结构状况，对红花石蒜和忽地笑的离体繁殖技术进行了初步研究，得出如下结论： 1 进行了红花石蒜和黄花石蒜双鳞片快速繁殖条件的研究，结果表明：红花石蒜在16小时800-1200 lx光照下比黑暗条件下出芽率要高；黄花石蒜在MS NAA0.2mg／L 6-BA4mg／L下出芽率为220％，红花石蒜在MS NAA0.2mg／L 6-BA2mg／L下出芽率为108％；NAA比IBA有利于石蒜生根；硅藻土显著提高黄花石蒜双鳞片出芽率，活性炭起抑制作用；6％蔗糖浓度有利于红花石蒜小鳞茎增重，MS 6-BA4mg／L NAA0.5mg／L培养基有利于小鳞茎增殖，切割一刀比两刀有利于小鳞茎增殖。

What would he tell Judith and the children?

他将怎样告诉朱迪丝和孩子们呢？

I this is at that time, the opinion with peacockish true girl is full of in a heart.

这就是当时的我，一个心中布满虚荣的女孩子真实的想法。