《英语》

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CONTENTS1

Lesson 1　Text：Power1

Supplementary Reading:8

Ⅰ．Power and Horsepower8

Ⅱ．Force and Work9

Lesson 2　Text：Pulleys and Belts11

Supplementary Reading:19

Ⅰ．Belts and Pulleys19

Ⅱ．The Lever21

Lesson 3 Text：Mechanized Farm Work22

Supplementary Reading:29

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

Ⅱ．Crops vs Farm Machinery30

Lesson 4 Text：Gears32

Supplementary Reading:40

Ⅰ．Gear Types40

Ⅱ．Driving Shaft41

Lesson 5 Text：Lubrication43

Supplementary Reading:52

Ⅰ．Friction and Lubrication52

Ⅱ．Bearings53

Lesson 6 Text：Pioneer Farm Machines55

Supplementary Reading:64

Ⅰ．Field Power64

Ⅱ．From Hand Farming to Power Farming65

Lesson 7 Text：Internal-combustion Engine67

Supplementary Reading:74

Ⅰ． Gasoline and Diesel Engines74

Ⅱ．Wankel Engine75

Lesson 8 Text：Changing Concepts77

Supplementary Reading:86

Ⅰ．Basic Functions of Tractors86

Ⅱ．Tractor Types87

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

Supplementary Reading:96

Ⅰ．Safety Requirements for Automatic Vehicle Control96

Ⅱ．Tomorrow's Combine97

Lesson 10 Text：Electric Motors for the Farm99

Supplementary Reading:106

Ⅰ．Induction Motors106

Ⅱ．Electric Power on Farms107

Lesson 11 Text：Hydraulic Pumps110

Supplementary Reading:120

Ⅰ．Hydraulics120

Ⅱ．Hydraulic Press or Jack121

Lesson 12 Text：The Art of the Crawler Driver124

Supplementary Reading:133

Ⅰ．Tracklaying Tractors133

Ⅱ．How to Avoid Danger on the Slopes134

附录136

Ⅰ．英译汉中的几个问题136

Ⅱ．总词汇表158