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Part 2 covers the areas of friction and lubricants, cross sections, parallelism, passivity and equilibration, levers, reducing the radius, immobilization, and transmitral of forces. Some elements of biomechanics are included in the article because of the interrelationship of biomechanics to engineering.
第2部分涵盖摩擦与润滑剂、横截面、平行度、钝化与平衡、杠杆、减小半径、固定以及力的经二尖瓣传输等领域。由于生物力学与工程学的相互关系，本文还包含了一些生物力学的元素。
