Results show that there existed no peculiar constructive species in the secondary community, but only hardy grasses and forbs.

The second stage may last 8 to 13 years, its characteristics is that species emerge or diminish sharply and has obvious constructive species;

第二阶段为演替的中级阶段，需8～13年时间，植物种数增减幅度大，建群种明显；

Field Spectral Features and Constructive Species Classification of Vegetation in Modern Yellow River Delta Using Landsat TM

现代黄河三角洲植被主要建群种野外光谱特征及TM分类试验

Floristic Characteristics of Main Constructive Species of Forest in Henan

河南森林主要建群种区系特性研究

The spatial distribution of constructive species of Northeast forest under the climate changing

气候变化条件下东北森林主要建群种的空间分布

The special pattern of the constructive species is the important features of the community.

森林群落建群种的空间格局是群落结构的重要特征。

Beijing is keen to strike a constructive note, urging collaboration to solve global problems.

北京方面敦促通过合作来解决全球性问题，渴望藉此给外界留下一种积极印象。

A Constructive Proof of Brouwer's Fixed Point Theorem Based on Integer Labelling

整数标号的Brouwer不动点的构造性算法

Constructive Proof of Two Classes of Felicitous Big Lobster Trees

两类大龙虾幸福树的构造性证明

Constructive proof about quadratic integrable function decomposition into analytic function

平方可积函数解析分解的构造性证明

The Constructive Proof and Calculation of the Solutions of Boundary Value Problem of Ordinary Differential Equation

常微分方程边值问题解的构造性证明及其计算

A Constructive Proof of the Competitive Equilibrium Existence in a Pure Exchange Economy

纯交换经济竞争均衡存在的一种构造证明

A Constructive Proof of Existence Theorem for Rational Form

有理标准形存在性定理的构造性证明

On Constructive Proof of Chinese Traditional Mathematics

中国传统数学的构造性证明

Production Status and Development Trend of Constructional Steel

建筑用钢材的生产现状与发展趋势

Technical application and investigation of the high strength constructional steel tie rod

高强度建筑钢拉杆的应用与研究

Considering the cost, life of use, it is good to use normal carbon constructional steel.

考虑其造价、寿命，用普通碳素结构钢为宜。

Investigation of the Fretting Fatigue Behavior of Medium Carbon Constructional Steel

中碳结构钢微动疲劳性能的研究

As the lightest constructional material, magnesium alloy has high specific strength, high specific stiffness, good magnetic-shielding ability, good damping ability, and good machinability.

镁合金是目前比重最轻的结构材料，具有高的比强度、比刚度和良好的磁屏蔽性、阻尼性、切削加工性等优点。

This paper mainly presents that constructional mid-carbon alloy steel, after bulk moulding deformation, heat treatment and cold surface deformation can raise fatigue strength of materials effectively.

本文主要介绍中碳合金结构钢经整体塑性变形、热处理后再进行表面冷变形工艺是提高材料疲劳强度的有效途径。

The Effect of Surface Deformation on Fatigue Strength of Constructional Mid-Carbon Alloy Steel and Strengthening Mechanism

表面变形对中碳合金结构钢疲劳强度的影响及强化机理