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The present study investigatated the effect on the diversification of weed community, including weed abundance, dominance, evenness, biomass, and mean height after mulching straw and intercropping white clover in the tea plantation from 2005 to 2006. The results were as follows: 16 families and 31 species were found in total. In April, the dominant species characterized with slow growth, lower biomass, and less than 30 cm height; in July those who grow faster with higher biomass and height became dominant; In September, these malignant communities reduced, while the oxalis and diffusa characterized with lower biomass and low height gradually increased. In the three seasons, the weed abundance, community diversity and evenness increased, and the dominance, the biomass and average height of weeds remarkably reduced after intercropping white clover and muching straw.

结果表明：茶园共有杂草16科31属31种，春季（4月）以生长速度较慢、生物量小、株高在30 cm以下的杂草为主，夏季（7月）以生长快、植株高和生物量大恶性杂草为主，秋季（9月）恶性杂草开始减少，酢浆草、白花蛇舌草等生物量小、株高矮的杂草逐渐增多；稻草覆盖处理茶园春、夏和秋季3个观测时期杂草物种丰富度、多样性、均匀度等指数均高于清耕对照，优势集中性指数低于清耕对照；间种白三叶草处理春、夏和秋季3个观测时期杂草总数量和生物量均显著低于清耕对照，夏、秋季杂草平均株高显著低于清耕对照；稻草覆盖和间种白三叶草处理春季茶芽重和产量显著高于清耕对照，鲜叶中游离氨基酸含量高于清耕对照，茶叶感官评审得分高于清耕对照处理。

On the basis of setting up a model of the parallel transmission link of short-wave data communication system, this paper analyses the anti-noise performance of data communication in a non-selective Rayleigh gradually fading ionosphere channel, and derives the average error code rate formular and its curves.

在建立并发制短波数据通信系统模型的基础上，分析了非选择性瑞利慢衰落电离层信道中数据通信抗噪声性能，并导出了平均误码率公式，生成了误码率曲线，为雷达情报短波数据通信链路的仿真及效能评估提供理论依据

The character of the target noise is studied systematically, especially the spectrum character of target noise are deeply analyzed. On the basis of it, the power spectrum of two sorts of target noise is estimated with the method of average periodogram using the actual measured data of target noise.

系统地研究了目标声场特性，对目标噪声的产生及其频谱特性进行了深入分析，在此基础上，利用目标噪声实测数据，采用加窗平均周期图法，对两类目标噪声进行了功率谱估计，并对其频谱特性进行了深入分析和研究。

Based on the piecework system, the Employee's average income during this employment period shall be $1200 to $1500 per month or even higher, provided that the Employee can perform his duties competently and efficiently and can deliver the qualified products according to the Employer's requirements and assignments.

在定额计价体制下，雇员在确保施工质量并按时完成所分配的工作量的情况下，在雇佣合同期内，平均每月工资总收入将介于1200新元至1500新元之间。

Based on the EHL theory, the average flow model and the asperity contact theory, the study is presented for mixed lubrication of piston pin bearing.

基于弹流润滑理论、平均流量模型及微凸峰接触理论，对发动机活塞销轴承的混合润滑进行了研究。

The planarity and the average degree of the bond of the initiators are discussed by the full-matrix least-squares on F〓.

通过最小二乘法计算结果，讨论了分子的平面性及键长平均化程度，诠释了分子内电荷转移的趋势及有可能的引发机理。

From calculating the maximum distance between the vertexes and their related average plane for each triangle, and based on the triangle area, surface attribute and the predefined characteristics, the algorithm gives out the triangle's weight, the collapse orders of triangle and makes a continuous level of detail model.

算法计算三角形顶点到相关平均平面的距离的最大值，结合三角形的面积、表面属性和预设特征给出三角形权值，确定折叠次序；并能够用累进网格实现连续的层次细节模型。

As in the case of Brazilian products exported, there was a positive variation in the average price of the main ornamental rocks products imported in 2008, a variation which when compared to the prices in 2007 has oscillated between 8, 1% to 12, 2%, depending on the type of product.

与巴西石材出口情况相比，巴西装饰石的进口情况比较乐观，与2007年的价格相比，08年进口石材价格涨辐在8.1%-12.2%之间。

In 1768 Franklin visited England as postmaster general and there he heard a curious complaint by Colonial board of Customs: Why did it take British mail ships which were called packets couple of weeks longer to reach New York from England then it took an average merchant ship to reach Newport, Rhode Islanddespite merchants ships leaving Londonhaving to sail down Thames and then the length of the English channelbefore they sailed across Atlantic, while the packets left from Falmouthin Cornwallright on the ocean's doorstep.

富兰克林在1768年访问英国邮政和有他听到一个奇怪的投诉由殖民局海关：为什么采取英国邮件的船舶，被称为包几个星期的时间来达到纽约英格兰那么它的平均商船来达到罗得岛新港尽管商家船舶离开伦敦后，驶向了泰晤士，然后长度的英吉利海峡，然后在大西洋航行，而包遗留法尔茅斯康沃尔有权对海洋的家门口。

All in all, America's government has put some 7% of GDP on the line, a vast amount of money but well below the 16% of GDP that the average systemic banking crisis ultimately costs the public purse.

总之，虽然美国政府已经在这次危机中投入了约相当于GDP 7%的财政收入，但还是低于系统银行风险引起财政支出的平均水平，该数字是GDP的16%。

By the time of its fall, most of the prisoners were writers who had written against the corruptions of the government.

到它被攻陷的时候，里面多数的犯人是写了反对政府贪污文章的作家。

The most obvious variation to ovum morphological character was that the color was changed from light green to sepiaceous in embryonic development, and all the ovums were almost hatched after 96h.

在胚胎发育过程中卵的形态特征最明显的变化是颜色从淡绿到深褐色，卵在发育96h后卵基本全部孵化。