四个

This paper is a generalization and summation of some new progress in marine chemistry in the recent decade. The principal contents consist of seven parts:1. Oceanological survey. The oceanological survey covered the China Seas, the Pacific Ocean and the Antarctic Ocean.2. Interaction of minor elements and suspended matter in seawater and the theory of in-terfacial stepwise ion/coordination partical exchange.3. Effect of organic matters on the liquid-solid interfacial exchange and the rule of left-righ...

本文对近十年来海洋化学的若干新进展作了总结，主要包括下述7方面：(1)海洋调查，包括中国近海、太平洋和南极等；(2)海水中微量元素-固体粒子的相互作用和界面分级离子/配位子交换理论；(3)有机物对液-固界面交换的影响和S-型曲线左右移动规律；(4)海水化学模型发展的三个新趋势；(5)海水中金属的络合容量和金属-天然有机配位体络合物的条件稳定常数；(6)海洋有机化学和海洋生物化学；(7)结论，对海洋化学发展的四个特点作了分析和讨论。

So in theory, the numbers of bound states should be more and more versus the width of well becomes wider.

如果磁场足够大，三维体材料中D~-中心有无穷多个束缚态，而二维D~-中心则只有四个束缚态存在。

Five or six holes with three or four balls may be plenty to begin with.

五六洞可能有三个或四个球首先充裕。

So, based on research on agroforestry system and structure optimization technology, this paper gives a theoretical and quantifiable study on structure optimization of agroforestry system on scales of among or in land cell, aspects including selection of species, dimension optimization, topological structure optimization and evaluation.

为此，本文在综合国内外农林复合系统研究以及结构优化技术研究的基础上，在土地单元间和土地单元内两个尺度上，植物材料选择、尺寸结构优化、拓扑结构优化以及优化模式评价四个层次，对三峡库区的农林复合系统结构优化进行了理论以及定量研究。

You are a public executive working on your fourth project to order new buses for transportation route between two cities.

作为公共事务执行官，你工作在你的第四个项目――为两个城市间的交通运输线路定购新巴士――上。

For example, suppose your query returns five tuples of the table, each tuple with four fields.

例如，假设你的5个表的查询返回元组，每个元组的四个领域。

DNA, RNA, and protein are all macromolecules which are unbranched polymers built up from smaller units.

这样，一个DNA序列可以看作是在一个有四个字母的字母表N={A，C，G，T}上的字，同样，蛋白质也可以看作是一个在20个字母上的字。

Ka-32A7 : Armed export version (alternatively known as Ka-327) of Russian Border Troops' Ka-27PV developed from military Ka-27PS for frontier and maritime economic zone patrol, with Osrninog radar and pairs of Kh-25 ASMs, UPK-23-250 pods each containing a GSh-23L twin-barrel 23mm gun with 250 rounds, or B-8V-20 pods each with twenty 80mm S-8 rockets, on four underwing pylons.

嘉- 32A7：武警出口的版本（或者ASMs称为'家嘉- 327），俄罗斯边防部队27PV发展从军事家27PS的边境和海洋经济区25个巡逻，与Osrninog雷达和对的Kh ，UPK - 23 - 250每荚含250轮，或B - 8V的20与20吊舱80毫米的S - 8火箭四个翼下挂架，每一个谷胱甘肽流量23L双管23毫米火炮。

Do the positions of the three pyramid images in the crystal hold a key to finding a fourth, as yet unfound subterranean pyramid, that is the fabled Hall of Records?

在水晶球里三个金字塔图像的位置隐藏着找到第四个金字塔位置的钥匙，到目前为止仍然没有发现地下的金字塔，难道真是虚构的霍氏预言？

The analysis suggests that some microRNAs may have as many as a few thousand targets, and that between 74% and 92% of the gene transcripts in four model genomes are likely under microRNA control through their untranslated and amino acid coding regions.

这项分析表明一些microRNA可能有几千个靶标，并且在四个模型基因组中74％到92％的基因转录可能由microRNA通过它们的未翻译和氨基酸编码区域来控制。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。