平衡方程和运动学关系式是与材料类无关的.The equations of equilibrium and kinematic relations are independent of the type of material.机械系统的运动学与动力学包括刚体的平面移动.Kinematics and dynamics of mechanical systems including rigid bodies in plane motion....
通过官方渠道是压根儿搞不到票的.You simply can't get a ticket through official channels.艾滋病病毒携带者的官方数字并不高。The official number of people carrying the AIDS virus is low.警方说他的死是个意外，起码官方消息如此。The police say his death was an accident, off...
潮水小的时候强风可以让船只改变航向。Strong winds can turn boats when the tide is weak.舵手独自一人就能变换航向。The helmsman could tack the boat singlehanded.根据星辰确定航向to navigate by the stars...