物理名词
Impulse
Physics The product obtained by multiplying the average value of a force by the time during which it acts. The impulse equals the change in momentum produced by the force in this time interval.
【物理学】冲量，推进力：力的平均值与它的作用时间相乘的结果。等于力在其作用时间段内产生的动量的变化
Speeds
Physics The rate or a measure of the rate of motion.
【物理学】速率：运动的速率或限度
Air resistance
A force that tends to oppose or retard motion.
阻力：倾向于妨碍或阻滞运动的力量
Newton's Laws of Motion
http://www.physics4kids.com/files/motion_laws.html
Acceleration
Abbr.aPhysics The rate of change of velocity with respect to time.
缩写a【物理学】加速度：速度相对于时间变化的速率
Mass
Abbr.mPhysics The measure of the quantity of matter that a body or an object contains. The mass of the body is not dependent on gravity and therefore is different from but proportional to its weight.
缩写m【物理学】质量：物体内所包含的物质的量。物体质量不受重力影响，因此与物体的重量不同，但是与其成比例
Cancel
To neutralize one another; counterbalance:
抵消，中和：使彼此中和；抵消：
two opposing forces that canceled out./ cancel each other
Orbits
n.The path of a celestial body or an artificial satellite as it revolves around another body.
运行轨道：天体绕另一天体或人造卫星绕一天体旋转所运行的轨道
Events
Physics A phenomenon or occurrence located at a single point in space-time, regarded as the fundamental observational entity in relativity theory.
【物理学】事件：在时空中位于一点的现象或事件，被认为是相对论中基本的观察实体
electromagnetic field
Physics A region of space characterized by a physical property, such as gravitational or electromagnetic force or fluid pressure, having a determinable value at every point in the region.
【物理学】场，磁场：有物理性质，如引力或电磁力或液压的空间区域，在此区域中每一点有一定值
Ether
1.Ether is a colourless liquid that burns easily. It is used in industry and in medicine as an anaesthetic.
...a sweetish smell of ether and iodine.
2.Physics An all-pervading, infinitely elastic, massless medium formerly postulated as the medium of propagation of electromagnetic waves.
【物理学】以太，能媒：一种在以前被假定为电磁波的传播媒质并具有绝对连续性、高度弹性的极其稀薄的媒体
cesium clock 铯钟
Coordinates
Mathematics Any of a set of two or more numbers used to determine the position of a point, line, curve, or plane in a space of a given dimension with respect to a system of lines or other fixed reference.
【数学】坐标：由两个或多个数值组成的数组中的任一数值，用来在一个直线系统或其它固定参照数值方面决定点、直线、曲线或平面在已知范围空间内的位置
Alpha Centauri
n.a multiple star in Centaurus whose three components represent the brightest object in the constellation, 4.4 light-years from Earth.
半人马座阿尔法星：人马座中的聚星，其三个组成部分是星座中最亮的部分，距地球4.4光年
light cone 光锥
n.a light cone is the path that a flash of light, emanating from a single event (localized to a single point in space and a single moment in time) and traveling in all directions, would take through spacetime.
Curvature
n.MathematicsThe ratio of the change in the angle of a tangent that moves over a given arc to the length of the arc.
【数学】曲率：切线通过给定弧线的角度变化与弧线长度之间的比率
