4.1.6VariantDesignA variant is a customized product designed to meet the needs of the customer.变体是一种为满足客户需求而设计的定制产品。For example.whenyou orderanew computer from companies suchas Dellyou can specify one of three graphics cards, two battery configurations, threecommunication options,andtwolevels of memory.Any combination oftheseis a variant that is specifically tuned to your needs.例如，当您从戴尔（Dell)等公司订购一台新计算机时，您可以指定三种显卡之一、两种电池配置、三种通信选项和两层内存。任何组合这些都是一个变体，专门调整您的需求
4.1.6 Variant Design A variant is a customized product designed to meet the needs of the customer. 变体是一种为满足客户需求而设计的定制产品。 For example, when you order a new computer from companies such as Dell, you can specify one of three graphics cards, two battery configurations, three communication options, and two levels of memory. Any combination of these is a variant that is specifically tuned to your needs. 例如，当您从戴尔(Dell)等公司订购一台新计算机时，您可以指定三种显 卡之一、两种电池配置、三种通信选项和两层内存。任何组合这些都是 一个变体，专门调整您的需求
4.1.7ConceptualDesignandProductDesignTwo other terms that will be used throughout the book are conceptual designand product design. These are catchall terms for two parts of the productdevelopment process.First,you mustdevelop a concept andthenrefinetheconcept into aproduct.Theactivities during the conceptual andproductdevelopment phases may makeuse of original,parametric,and selectiondesignandredesignasneeded.另外两个术语是概念设计和产品设计。这些都是产品开发过程的核心部分。首先，您必须开发一个概念，然后将概念细化为产品。概念和产品开发阶段的过程可根据需要使用原始的、参数化的和选择的设计和重新设计
4.1.7 Conceptual Design and Product Design Two other terms that will be used throughout the book are conceptual design and product design. These are catchall terms for two parts of the product development process. First, you must develop a concept and then refine the concept into a product. The activities during the conceptual and product development phases may make use of original, parametric, and selection design and redesign as needed. 另外两个术语是概念设计和产品设计。这些都是产品开发过程的核心部 分。首先，您必须开发一个概念，然后将概念细化为产品。概念和产品 开发阶段的过程可根据需要使用原始的、参数化的和选择的设计和重新 设计
4.1Differenttypes of mechanicaldesignproblemsWordsandExpressionsparametricdesign[paera'metrik'di'zain]参数设计bicycle [baisikl Ia wheeled vehicle that has two wheels and is moved by foot二轮（车）pedals
Words and Expressions parametric design [pærə'metrɪkˈdiˈzain]参数设计 bicycle [ 'baisikl ] a wheeled vehicle that has two wheels and is moved by foot pedals 二轮（车） 4.1 Different types of mechanical design problems
4.1Differenttypes of mechanicaldesignproblemsQuestions forDiscussion1. Decompose a simple system such as a home appliance, bicycle, or toy intoits assemblies,components, electrical circuits,andthelike
Questions for Discussion 1. Decompose a simple system such as a home appliance, bicycle, or toy into its assemblies, components, electrical circuits, and the like. 4.1 Different types of mechanical design problems
MAINCONTENTSOFTHECHAPTER 4.1Different types of mechanical design problems4.2Machineelements in mechanical design4.3Friction,Wearand Lubrication4.4IndustrialRobot
4.1 Different types of mechanical design problems 4.2 Machine elements in mechanical design 4.3 Friction, Wear and Lubrication 4.4 Industrial Robot MAIN CONTENTS OF THE CHAPTER