图3.21画出了平行于斜面的、相互保持平衡的几个力。
Figure 3.21 shows the forces parallel to the plane that are responsible for the equilibrium.
一个物体如果受到几个力的作用而仍然保持平静，我们就说该物体处于平衡状态。
If a body is acted upon by a number of forces and still remains motionless, the body is said to be in equilibrium.
一个物体要是遭到几个力的作用而依然维持僻静，咱们就说该物体处于均衡状况。
If a body is acted upon by a number of forces and still remains motionless, the body is said to be in equilibrium.
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