The book remains at rest or, in physical terminology, in static equilibrium not because there are no forces acting on it but because the forces which do act on it annul one another.
They firmly believe that once their mental and physical well-being are in equilibrium, then good health, work efficiency and prosperity will come their way naturally.
当身心得到平衡，他们深信健康、工作效率和富足的生活，便会随之而来。
3
The primary combustion of deficient oxygen solid propellant is non equilibrium because of its own physical and chemical processes.