多化的

We discussed the syntheses of two different types of plant alkaloids in this thesis. In part A, we aimed at total syntheses in two kinds of aporphine alkaloids, lirioferine and boldine. In part B, we developed a tactic about radical cyclization in polyhydroxylated piperidine synthesis.

中文摘要本篇论文中探讨了两种不同种类植物碱的合成，在A部分中，我们针对阿朴吩类天然物中的鹅掌楸啡碱与波儿丁碱做了各自的全合成研究；在B部分中，我们发展了一种自由基环化策略运用在含多羟的哌啶类化合物之合成上。

It is a modular, real-time, a powerful communications capabilities, preemptive multitasking embedded operating system.

它是一种模块化的、实时的、有强大通信能力的、抢先式、多任务的嵌入式操作系统。

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。

A single document may address the requirements for one or more procedures. A requirement for a documented procedure may be covered by more than one document.

一个单独的文件可包括一个或多个程序的要求；一个文件化的程序可被一个或一个以上的文件覆盖

This paper, based on the secong approach, presents a new efficient algorithm to design symmetric bi-orthogonal M-band wavelets with arbitrary regularity by using Grobner basis and syzygy module algorithm in computing algebra, which bi-orthogonalizes the polyphase matrix line by line.

本文基于第二种思路结合计算代数中Groebner基和合冲模的思想和算法提出了一种同时具有任意正则阶和线性相位性质的M带双正交小波的新型高效构造算法，其中采用多相位矩阵逐行双正交化的方法。

Aristotle distinguished between the potential infinite and the actual infinite, and concluded there is in general no actual infinite object because the infinite is the unfinished, the indefinite, the unrealizable, which cannot be completed and actualized.

亚里士多德把潜无穷和实无穷区别开来，得出结论：一般不存在实无穷的对象，无穷是没有结束的、非确定的、没有实现的，并且是不能完善和实在化的东西。

Piaotang tungsten deposit is one of the most important quartz-vein type wolframite deposits in Southern Jiangxi Province where is the most important tungsten producing place in China, The wolframite-bearing quartz veins have the characters of multistage mineralization.

赣南是我国最重要的钨矿产地，漂塘钨矿是赣南的一个重要的大型石英脉型黑钨矿床，含矿石英脉具有多阶段矿化的特征。

But on account of excessive cut since 1949, forest resources cutdown sharply, bring a series of problem, for instance, forest productivity decrease, forest habitat fragmentation, agrestic species become extinct at a high speed, environmental quality decline, this paper discussed forest resources change in Heilongjing Province from statistical change feature of forest resources and forest landscape pattern change, using model of GM(1,1) to predict the development trend of forest resources here.

但由于半个多世纪的过量采伐，致使森林资源锐减，带来了森林生产力下降、森林生境破碎化、乡土物种加速灭绝和环境质量下降等一系列问题。本文从森林资源统计变化特征、森林景观格局变化两个方面对黑龙江省森林资源的变化进行了研究，并用灰色理论的GM(1，1)模型对该省森林资源未来的发展进行了预测。

To promote the development and application of multicolor silk, the morphological structure of the nature yellow silkworm silk from a silkworm variety, selected by cross breeding method, was investigated by SEM and compared with the normal white silkworm silk, the golden wild silkworm silk from Cambodia, and the Antheraea pernyi silk, respectively.

为了进一步促进彩色蚕丝的开发和应用，研究了通过杂交育种获得的天然黄色家蚕茧丝的外观形态和截面结构特征，并与普通白色家蚕丝、柞蚕丝和来自柬埔寨的多化性黄茧家蚕丝进行了比较研究。

Intercalation of metal complexes into the interlamellar space of clay is an excellent method for homogeneous catalyst heterogenization .

粘土的可膨胀的二维空间有助于将催化活性的金属络合物用阳离子交换法和配位体交换法插入到粘土层间，因而易于制得粘土层间金属络合物催化剂，这是匀相催化剂多相化的一种好方法。

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。