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"Though hydrometallurgy originate d in the 16th century, its principal development took place in the 20th century."

湿法冶金开始于16世纪，在20世纪获得重大发展。

A large body of water constituting a principal part of the hydrosphere .

形成地球水圈主要部分的巨大水体。注意，注意力集中

The model has overlay and index method as the basic, mathematical model and statistical method embedded to form an integrated model. The HYDRUS model is performed to obtain the rating system, and principal component analysis and factor analysis are used to get the weighting system.

该模型以参数系统法为基础，将数学模型和统计方法嵌入该综合模型中，通过HYDRUS模型进行数值模拟来建立评价因子的评分体系，权重体系由主成分－因子分析法得到。

In this study, we adopt a Scale-Invariant Gauss-Markov hyetograph that show the maximum likelihood estimator of the dimensionless hyeto graph. There are five significant principal components were extracted which explained total variance about 90%.

研究中采用具尺度不变性高斯马可夫雨型（Scale-Invariant Gauss-Markov，简称SIGM），并将此资料进行多变量统计分析，以主成份分析法萃取出设计雨型之五个主要成份，此五个主成份具有解释设计雨型总变异数之程度约为90%。

By combining the principal component analysis and cluster analysis techniques, we select five factors and group design storm hyetograph into three categories in the study area. Finally, we employ the method of analytic hierarchy process to establish the regionalized representative hyetograph for Northern Taiwan area.

本研究针对台湾北部地区提出一个新的方法来评估并建立区域代表雨型，首先建立各测站具尺度不变性之高斯马尔柯夫雨型，其次利用主成份分析法萃取出雨型中的5个重要的控制因素，再就这些因素以聚类分析法将研究区域内之设计暴雨雨型分为3个均匀群集，但同一群集内之雨型并非唯一，故研究中最后利用层级分析法进行评估，选取并建立出区域代表雨型。

Thus, we propose a new depth function to deal with such concave shape data sets using the principal of smallest hypersphere in the Gaussian kernel feature space.

本文从样本深度的角度，利用高斯核特征空间最小球原理，提出了一种广义的数据深度。

Some properties of inversions are proved, It indicates that the inversion is conformal, the image of line of curvature is still the line of curvature of the inversion S of the hypersurface S, the principal curvature, the total curvature, and mean curvature of S are the functions...

在n-1维超曲面的反图变换中，示明反图变换为保角表示法，曲率线系的反影仍为反超曲面的曲率线系，反超曲面的主曲率，全曲率与平均曲率为原超曲面的主曲率的函数等。 3。最后导出公式(1)在四维空间与通常空间之特殊形式

Two principal types of seismic waves are generated, body waves which travel from the hypocenter directly through the earth's lithosphere and surface waves which travel from the epicenter along the surface of the earth.

主要有两种类型的地震波生成、这波从震源旅游机构直接通过地球表面的岩石圈、旅行中浪从震央沿地球表面。

We treated the principal part of this competition as the ichnography design regardless of the topics represented, for there is much huger number of undergraduates more than that of students major in art.

针对我校学生以本科生为主、艺术专业学生比例较小的特点，我们将此次比赛定为规定设计主体、参赛作品主题不限。

With his greatly varied activities, including his often iconoclastic writings, he was the principal figure of the postwar international musical avant-garde.

由於他参与的活动十分多样，包括经常打破常规的著述，因而他是战后享誉国际的音乐先驱人物。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。