有四种

Linear regression analysis showed that the product of Freundlich adsorption constants, Kf(1/n), had a positive correlation with 1/Sw and/Sw, showing that the adsorption of acetanilide herbicides on soil was mainly controlled by the content of soil organic matter and the solubility of herbicides.

四种酰胺类除草剂的 Freundlich 吸附常数 Kf(1/n)与1/Sw 、/Sw 有很好的线性相关性，这说明它们在土壤中的吸附主要受土壤有机质含量控制；分子中酰胺 N 的醚取代基的结构差异造成的溶解度差别，是导致不同酰胺类除草剂在土壤上吸附差别的主要原因。

The results showed that the soil catalase and dehydrogenase activities, soil microbial biomass N and microbial biomass C were restrain somewhat by four acetanilide herbicides at the beginning of cultivation, but can recover soon.

研究表明，培养初期丁草胺、乙草胺、丙草胺和异丙甲草胺对土壤过氧化氢酶和脱氢酶活性、对土壤微生物量氮和微生物量碳有不同程度的抑制，但均能很快恢复，四种供试酰胺类除草剂对土壤生态的影响不大，除草剂之间也没有表现出显著差异；培养初期rac-异丙甲草胺和S-isomer高浓度处理均比常规用药量处理对土壤酶、土壤BN和Bc的影响大。

One or both of the Algonquian languages of the Delaware.

这四人中有几种交流方式？；两屋间的秘密走廊用来。

The spiny anteater, an egg-laying mammal native to Australia and New Guinea, has a penis with four heads, but only two fit into the female at once.

针鼹是一种生活在澳大利亚和新几内亚的产卵哺乳动物，十分奇特的是，它的阴茎上有四个头，每次性行为时只能将其中两个头插入雌性体中

A large, chiefly aquatic African herbivorous mammal having thick, dark, almost hairless skin, short legs with four toes, and a broad, wide-mouthed muzzle.

河马非洲的一种大型水生食草型哺乳动物，皮厚且黑，几乎无毛，短腿，有四个脚趾，口鼻宽阔突出1。养成修剪鼻毛与耳毛的习惯

Then we define the stable distribution with four equivalent ways and analyze its properties carefully. To study the stable distribution, we must know how to simulate its random variables. We can learn it intuitively by watching its plot of density function.By adding an auxiliary variable in the Chapter 4, we estimate the four parameters using Gibbs sampler.

接着给出了稳定分布的四种等价定义方法，详细的分析了稳定分布的性质，提出如何利用简单随机数产生稳定分布的随机变量以便我们进行分析研究，借助稳定分布近似密度函数的图形我们对它的特征会有更加直观的认识。

Or try a baguette accompanied by one of 400 French cheeses.

你也可以嚐嚐夹了法国乳酪的法国棍子面包，法国乳酪有四百种之多。

The properties of four factorized chi-square forms, which are used in minimization of correlated data, are studied, including their biasness and unbiasedness.

研究了关联实验数据的四种因子化形式的χ2 表达式及其极小化性质，同时讨论了极小化估计值的有偏性与无偏性。

By using the signal flow graphs of the integrators in Z domain, four kinds of SI integrator circuits are given. 4. The design method of SI biquadratic filters is proposed.

研究了四种离散时间积分器的特性，并与连续时间积分器的特性进行了比较，得到一些对开关电容和开关电流滤波器的设计有价值的结果。

Any of various arthropods of the class Arachnida,such as spiders, scorpion s,mites,and ticks,characterized by four pairs of segmented legs and a body that is divided into two regions,the cephalothorax and the abdomen.

蜘蛛纲动物一种蜘蛛纲节肢动物们，如蜘蛛、蝎子、小虫及扁虱，特征是有四对分节的腿和分为两部分即头胸部及腹部的身体

Lugalbanda was a god and shepherd king of Uruk where he was worshipped for over a thousand years.

Lugalbanda 是神和被崇拜了一千年多 Uruk古埃及喜克索王朝国王。

I am coming just now,' and went on perfuming himself with Hunut, then he came and sat.

我来只是现在，'歼灭战perfuming自己与胡努特，那麼，他来到和SAT 。