前言的

If we are of the same type of tree, please do not preface to give up!

如果我们都是同一类的小树，请你不要前言放弃！

This paper consists of three parts: preface, main content and conclusion.

前言部分主要介绍了论文写作的背景和意义。

It mainly introduces the background, the present studying of population dynamics at home and abroad and the preparative theory.

第一章是前言，主要介绍了本文选题的背景，研究现状以及预备知识。

But it is of another cause of misunderstanding that I wish principally to speak in this preface.

在这篇前言中我主要想说明产生误读的另外一个原因。

Foreword: Pure mathematics is, in its way, the poetry of logical ideas.

前言 纯粹数学，就其本质而言，是逻辑思想的诗篇。

In China, the typical equipements to test the friction coefficient of highway pavement are SCRIM and Portable Friction Tester.

前言目前国内测定路面摩擦系数的仪器主要有横向力系数测试车和摆式摩擦系数测试仪。

The preface presents general introduction about the study on semivowel and which researchers did.

前言主要介绍了前人研究、音的概况。

The statistic characteristics of engineering indexes for muddy silty clay at Fengxian district in Shanghai are studied.

1前言在进行岩土工程可靠度分析时，首要问题是确定各随机变量的概率特征。

I think a launch/shipping announcement of R520 and CrossFire either sequentially or simultaneously would put ATI's best foot forward, as CrossFire has lost a bit of its steam by this point

我认为相继或者同时发布r520和crossfire会ati以后的路更好走(话序前言，在哪里跌倒，就在哪里爬起来，你死了咱日子也不好过)。

An account of main development and main advances of rare earth hydrogen storage cell is given in this paper.

前言 稀土贝宁氢电池是一种新型的化学电源，也被称为镍氢充电电池。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。