事实上，我们推断蝙蝠在分析回声时过滤掉了很多因素，就像一个复杂的雷达系统可以忽略地面上静止物体的回声那样。
In fact, we kind of assumed that they were filtering a lot out, the way a sophisticated radar system can ignore echoes from stationary objects on the ground.
地面是一个静止的立方体，这是Box2D已知的，因为这个立方体的质量为零(默认)，因此不会与其他物体相撞。
The ground is a box that is static, which Box2D knows, because the box has zero mass (by default) and therefore doesn't collide with other objects.
“每一个物体保持其静止状态…除非有加于其上的力，它才会改变那种状态”(伊萨克·牛顿)。
"Every body continues in its state of rest... Unless it is compelled to change that state by forces impressed upon it" (Isaac Newton).
一个物体如无外力作用，它将继续保持静止或作直线运动。
An object remain at rest or moves in a straight line unless a force ACTS upon it.
力学是自然科学的一个分支，它研究物体的运动，而把静止看成是运动的一种特殊情况。
Mechanics is that branch of physical science which considers the motion of bodies, with rest as a special case of motion.
“油污带不是一个静止不动的物体。”他对华尔街杂志这样说。
"The plume is not a stationary object," the Wall Street Journal.
每一个物体都保持它自身的静止的或者一直向前均匀地运动的状态，除非由外加的力迫使它改变它自身的状态为止。
Every body continues in its state of rest, or of uniform motion in a right line, unless it is compelled to change that state by forces impressed upon it.
讲者和作家通过独白的形式勾勒出一个虚拟的人物，或者静止的物体，或者一个想法。
Monologues are wherein the speaker or writer addresses an imaginary person, inanimate object, or idea.
结论是：假如以同样的一个力作用于两个不同的。原来静止的物体上，那么产生的速度将不一样。
The conclusion is: if the same force ACTS on two different bodies, both initially at rest, the resulting velocities will not be the same.
根据惯性定律，一个物体一旦运动，在受外力作用之前永远不会停止运动；同样，一个静止的物体在受到外力之前，永远不会自行开始运动。
According to the law of inertia, a body once in motion will never stop till a force compels it, nor will a body at rest start to move of its own accord.
关于一个从静止状态自由下落物体在经过各连续时间间隔后的位置和速度(图略)在下面进行讨论。
The position and speed of a body falling freely from rest after successive intervals of time (figure not shown) is dealt with in what follows.
一个静止不动的物体是容易瞄准的。
若没有外力的作用，一个静止的物体会保持静止而一个运动的物体会做均速直线运动。
A body at rest will remain at rest and a body in motion remains in motion at a constant speed in a straight line, unless acted upon by an external force.
如果任何占据一定空间的物体都是处于静止状态的，如果处于运动中的物体在任何时间都占据这样一个空间，那么飞矢即是不动的。
If everything when it occupies an equal space is at rest, and if that which is in locomotion is always occupying such a space at any moment, the flying arrow is therefore motionless.
在一个惯性坐标系中与物体静止质量相当的能量；等于静止质量乘以光速的平方。
Equivalent and Difference of Natural Coordinate System with Right Angle Coordinate System When Constraining Anti-force Comes into Being;
在一个惯性坐标系中与物体静止质量相当的能量；等于静止质量乘以光速的平方。
Equivalent and Difference of Natural Coordinate System with Right Angle Coordinate System When Constraining Anti-force Comes into Being;
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