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CONTENTS 1

Lesson 1　Text：Power 1

Supplementary Reading: 8

Ⅰ．Power and Horsepower 8

Ⅱ．Force and Work 9

Lesson 2　Text：Pulleys and Belts 11

Supplementary Reading: 19

Ⅰ．Belts and Pulleys 19

Ⅱ．The Lever 21

Lesson 3 Text：Mechanized Farm Work 22

Supplementary Reading: 29

Ⅰ．Preface to"Farm Machinery and Equipment"（Extracted） 29

Ⅱ．Crops vs Farm Machinery 30

Lesson 4 Text：Gears 32

Supplementary Reading: 40

Ⅰ．Gear Types 40

Ⅱ．Driving Shaft 41

Lesson 5 Text：Lubrication 43

Supplementary Reading: 52

Ⅰ．Friction and Lubrication 52

Ⅱ．Bearings 53

Lesson 6 Text：Pioneer Farm Machines 55

Supplementary Reading: 64

Ⅰ．Field Power 64

Ⅱ．From Hand Farming to Power Farming 65

Lesson 7 Text：Internal-combustion Engine 67

Supplementary Reading: 74

Ⅰ． Gasoline and Diesel Engines 74

Ⅱ．Wankel Engine 75

Lesson 8 Text：Changing Concepts 77

Supplementary Reading: 86

Ⅰ．Basic Functions of Tractors 86

Ⅱ．Tractor Types 87

Lesson 9 Text：Any Progress on Farm Vehicle Automation? 89

Supplementary Reading: 96

Ⅰ．Safety Requirements for Automatic Vehicle Control 96

Ⅱ．Tomorrow's Combine 97

Lesson 10 Text：Electric Motors for the Farm 99

Supplementary Reading: 106

Ⅰ．Induction Motors 106

Ⅱ．Electric Power on Farms 107

Lesson 11 Text：Hydraulic Pumps 110

Supplementary Reading: 120

Ⅰ．Hydraulics 120

Ⅱ．Hydraulic Press or Jack 121

Lesson 12 Text：The Art of the Crawler Driver 124

Supplementary Reading: 133

Ⅰ．Tracklaying Tractors 133

Ⅱ．How to Avoid Danger on the Slopes 134

附录 136

Ⅰ．英译汉中的几个问题 136

Ⅱ．总词汇表 158