四体

Based on the theoretical model coupling Maxwells equation with the rate equation of 4 level inverted population, the numerical simulation is made via the FDTD method and MATLAB programs. The simulation results show that 1. With the increase of the pumping rate, both the localization of the electric field and the spectrum mode numbers will change; 2. The lasing threshold decreases by increasing the size or concentration of the scatters; 3. The lasing threshold also decreases by increasing the size of samples or strengthening the sample randomness.

在理论和实验研究的基础上，利用麦克斯韦方程与四能级反转粒子数的速率方程相耦合的理论模型，采用时域有限差分方法和MATLAB程序对随机激光泵浦阈值特性进行了数值模拟与计算，模拟结果显示：随着泵浦速率的增大，出现了阈值前后电场强度局域态及频谱模式数的改变；随着散射体粒径的增大，浓度的增大，阈值呈现下降的趋势；随着样品长度的增大，随机强度的增强，阈值也呈现下降的趋势。

The present study is involved in the expression of vitronectin , a ligand of integrin, on human spermatozoa and its role in fertilization; the expression of integrin α〓、α〓、β〓 sbunits on human and mouse oocytes and their relationship with maturation of oocytes; the reorganization of cytoskeletal protein, actin, of mouse oocytes mediated with RGD peptide binding with integrins; the roles and mechanisms of integrins in activation of mouse oocytes as trasmembrane signaling receptors, using the methos of cell culture, immunohistochemistry, flow cytometer, laser confocal microscope.

本课题采用细胞培养、免疫组化、流式细胞术、激光共聚焦显微技术进行以下四个方面的研究：整合素配体玻连蛋白在人精子的表达及其与精子功能状态及受精的关系：整合素〓在人、小鼠卵的表达及其与卵的成熟程度的关系：整合素介导小鼠卵内actin骨架蛋白的重组；整合素介导卵激活的早、晚期事件，包括卵细胞内钙离子浓度的变化及孤雌发育胚的形成，并探讨其机制。

Streamer hooks are extra long, at least 4x and up to 6x, for buggers, muddlers, and the whole rich library of streamer patterns, used for all types of game fish.

飘带钩都超长，起码四倍体高达6x，buggers，muddlers，而整个图案丰富图书馆飘带，用于各种野味鱼。

There were obvious cyclothems which consisted of evaporites, deep color mudstones or shales and deep-water turbidity sediments in Sha-4 member of Dongying sag.

东营凹陷沙四段广泛发育的蒸发岩在剖面上与暗色泥岩、页岩和深水浊积砂体呈明显的韵律层。

In chapter 8, the complex of n-dimensional and geometry models of n+2 points are analyzed. The algorithm of high dimensional Delaunay triangulation is discussed.

第八章以四维空间为例分析了n维空间的单纯体构造和n+2个点的空间几何构型，探讨了高维空间的Delaunay三角化算法。

Botany lacking one or more of the four whorls of the complete flower--sepals or petals or stamens or pistils.

缺少完全花的四个轮生体当中的一个或者多个——萼片、花瓣、雄蕊或者雌蕊。

Study on the time-resolved fluorescence spectroscopy of four kinds of allophycocyan in trimers.

四种别藻蓝蛋白三聚体的时间分辨发光光谱研究。

Study on the time-resolved fluorescence spectroscopy of four kinds of allophycocyanin trimers. Chin. J.

四种别藻蓝蛋白三聚体的时间分辨荧光光谱研究。

The earliest tetrapods were all carnivorous, so it is unlikely that, as adults, they fed much on land during the first phases of their evolution, because the only prey they would have found there were insects and other small arthropods.

最早的四足动物都是肉食性的，那时陆上的食物只有昆虫与小型节肢动物，所以成体不太可能在演化初期就以陆地做为主要的摄食处。

The newly found species, Tiktaalik roseae, has a skull, a neck, ribs and parts of limbs that are similar to four-legged animals known as tetrapods, as well as fish-like features such as a primitive jaw, fins and scales.

最近发现的种类， Tiktaalik roseae，有一块头骨、一个脖子、与四足动物tetrapods类似的肢体的部分肋骨，以及似鱼功能，例如一个原始下颌、飞翅和鳞状体。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。