Balancing the firstorder reciprocating inertial force through single-axis balance mechanism can evidently reduce the engine vibration. 摘要采用单轴平衡机构完全平衡一阶往复惯性力，可大大减轻发动机振动。
Inertia force and moments of flapping wing in insect flight were studied using the methods of theoretical modeling and simulation. 摘要用理论模化和仿真试验相结合的方法，研究了昆虫翅膀扑动产生的惯性力和惯性力矩。
The lateral force should act perpendicular to the measuring axis at the point where force is introduced. 侧力应垂直作用在力引入点的轴上。
