抽取

Principal component analysis ; feature extraction ; modular principal component analysis ; feature matrix ; face recognition

主成分分析；特征抽取；分块PCA ；特征矩阵；人脸识别

The sample consisted of 1,100 teachers from senior high schools in Taiwan. Within the 950 feedback data, the percentage of valid data was 83%. The data were analyzed by using descriptive statistics, t-test, one-way ANOVA, Pearson' product- moment correlation and stepwise regression analysis.

研究对象为台湾地区的公私立高级中等学校，共抽取1100位高级中等学校教师为研究样本；回收问卷为950份，有效问卷比例为83%；将有效问卷以描述性统计、t考验、单因子变异数分析及Pearson积差相关及多元逐步回归分析等统计方式加以分析并进行讨论。

Methods: According to the principle of stratified proportional sampling, a total of 1605 adult subjects from 17 cities and their surrounding rural areas of China was measured by CWVDT.

自编中文字词识别测验，经条目筛选后采用分层比例抽样方法，在全国五个行政区17个大中城市及周边农村抽取样本1605例。

The survey conducted in Taiwan was designed using a multiple-stage sampling method that utilized the principles of probabilities proportional to size, stratified sampling, and systematic sampling to strengthen the sample's effective representation.

为符合研究的需要，本次研究的抽样方法采取较复杂的多阶段抽样法，主要应用「抽取率与单位大小成比例」原则，结合分层抽样、等距抽样等抽样方法的优点，以求提高样本代表性。

The results have been adopted as the reference frame of the multi-stage, PPS (Probability Proportional to Size) sampling design of the 2005 National Health Interview Survey in Taiwan.

本文结果亦已被2005「国民健康访问调查」所采用，做为进分层多阶段、抽取与单位大小成比之等机抽样设计之考。

With self-compiled "Questionnaire of the life stress on students in university who anticipate that mainland China students study in Taiwan." The survey uses the method of proportional allocation, and the sampling is based on the proportion of total students in 29 colleges.1000 college students were selected as sample subjects and given a questionnaire survey.

本研究系以自编《我国大学生预期陆生来台就学之生活压力调查问卷》为研究工具，研究对象按照各校总学生数进行比例配置取样，随机抽取北部地区29所一般大学日间部大学生1000人，进行问卷调查研究，其中有效样本为937人。

112 male workers who had exposed to lead at least for one years were selected from a puddling factory in the suburb of Chengdu. Except those who had history of disease , such as hypertension, heart disease, diabetes, tumor and severe mental disorder.

对象与方法：整群抽取成都市郊区某炼铁厂接铅1年以上的作业人员，排除了在铅作业前患有高血压、心脏病、糖尿病、肿瘤和严重精神疾患者，共112人纳入此次研究。

The water we used was pumped up from a well.

我们用的水是从井中抽取的。

The construction of numeral abbreviation can be roughly grouped into four types: subordination, coordination, subject+predicate and verb+object. Among them, subordination occupies the main part. Numeral abbreviation can be derived from either extracting the first, the middle or the last morpheme from its original words or generalizing them. Numeral abbreviation consists of four classes: word, phrase, sentence and text in terms of its original words. Most numeral abbreviations are disyllabic and quadrisyllable, and only a small number of them are trisyllabic and polysyllabic.

数字缩略语的结构有类化的特点，包括偏正式、并列式、主谓式、动宾式等，其中以偏正式为主；在抽取方式上，数字缩略语有抽头式、取中式、取尾式和统括式；从缩略的对象上看，数字缩略语的缩略可分为词、短语、句子和篇章四个层次；在音节分布上，数字缩略语以二、四音节为主，三音节和多音节为辅。

Although the hop extract was only a weak quencher of free radicals formed from 1,1-diphenyl-2-picrylhydrazyl, it demonstrated strong

虽然蛇麻抽取物只是一种由1，1-二苯基-2-苦基肼组成的游离基弱淬火物，但它在Hepa

She gently rebuff ed him, but agreed that they could be friends

她婉言拒绝了，但同意作为朋友相处。

If in the penal farm, you were sure to be criticized.

要是在劳改农场，你等着挨绳子吧！