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CONTENTS 1

Lesson One 1

Lesson Two 16

Lesson Three 31

Lesson Four 43

Lesson Five 55

Lesson Six 67

Review One 80

Lesson Seven 84

Lesson Eight 97

Lesson Nine 109

Lesson Ten 124

Review Two 138

Lesson Eleven 142

Lesson Twelve 156

Lesson Thirteen 168

Lesson Fourteen 182

Lesson Fifteen 196

Review Three 209

Lesson Sixteen 213

Lesson Seventeen 226

Lesson Eighteen 240

Lesson Nineteen 254

Lesson Twenty 269

Lesson Twenty-One 280

Lesson Twenty-Two 292

Review Four 306

Ⅰ．Engineering and the Sciences 313

Supplementary Reading 313

Ⅱ．The Main Tasks of an Engineer 314

Ⅲ．Engineering：The Application of Scientific Principles 316

Ⅳ．Mechanical Engineering 317

Ⅴ．The Basic Machining Techniques 318

Ⅵ．The Nature of Material Science 319

Reference Translations 321

Key to the Exercises 354

Appendixes 418