前言的

Introduction UVR is one of important factors for cataract.

前言 紫外线是引起白内障的重要环境因素之一。

A new radiator(strengthened tubular and corrugate fin type radiator) was presented in the paper.

1前言冷却系统是内燃机车的重要组成部分，其作用是使机车维持在最佳工作温度。

A new separator used to remove the dispersive oil droplets from waste water of oil fields and oil refineries was developed with inclined corrugate plates as packing.

1前言 对油田或炼油厂来说，污水处理首先是除油，随着生产发展和环境保护日益严格的要求，迫切需要开发高效含油污水处理设备。

It is a coursebook of elementary practice that no beginners should skip over.

我觉得这个句子是在书评或者前言里，所以应当符合英文的习惯

The structure, character, production condition and procedure about damped steel sheet were introduced in this paper.

1前言减振钢板是近几年来日本等工业发达国家研制开发的一种新型复合板材。

Microwave desiccation is a new technique and is widely used in recent years.

前言微波干燥是近年来被广泛应用的一项新技术。

I like to preface my articles with a disclaimer.

我喜欢与免责声明前言我的文章。

He gave a rather disjointed account of his experience in the jungle.

在谈到他在热带丛林里的经历时，他的话前言不对后语。

Preface This document of' Handling Precautions and Guideline LIP Rechargeable Batteries shall be applied to the battery cells manufactured by XUNLIDA.

前言 本文件"聚合物锂离子充电电芯操作指示及注意事项"仅适用于迅立达生产的电芯。

The engine ECU dynamic test and analysis system is built with computer simulation and test technology.

1前言 汽车发动机ECU是一个复杂的车载计算机系统。

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。