三个力的作用线相互平行的例外情况，我们将在第三章讨论。
There is an exceptional case, three forces with paralleled lines of action, which will be discussed in Chapter 3.
下颌骨较大压应力区位于力的作用线周围区域，较大拉应力区位于下颌支后部及下颌角附近区域。
The stresses in the glenoid fossa were the greatest in the back slope of the articular eminence. The regions of the greater compressive stresses of the mandible were those around the force line.
睡眠方向顺应了磁力线，在磁场力的作用下，气血运行畅通。
Sleep direction of the magnetic field line, in the magnetic field under the action of blood running smoothly.
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