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Then he flung outward, feet first, with a swish, Kicking his way down through the air to the ground.
然后，纵身一跳，他两脚先伸出去，在空中乱踢乱舞，于是飕的一声，降落到地面。
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I mean, obviously you've got all the shops on the ground floor
显然地，所有的商店都在地面上。
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It's dangerous to want to get away from earth awhile, to get your feet entirely off the ground.
想要逃离地面一会，让自己的双脚同时离开地面很危险。
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I know some of you come from Europe and other parts of the world where the ground floor is rez-de-chauss?e or some silly thing like this 1 and you push a button on the elevator to one and you go up to the first floor.
我知道你们中间有些人来自欧洲,或者世界其他地方，你们那里的一楼,和地面齐平，或者像这样可笑的事情,比如你要按下电梯的按钮,然后才能上到真正的1楼。
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Here it meant particle that was released from the ground earlier.
这里我说的是先前从地面释放的质点
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Milton has dug up a gem from the pages of The Iliad, and this gem has something like a Medusa effect on the poem or perhaps on us as readers. Time almost seems to stop when we begin appreciating this image solely on aesthetic grounds.
弥尔顿从《伊利亚特》中挖出了一块瑰宝，这块瑰宝对于诗或我们读者起得作用,如同美杜莎一样，在我们只欣赏着,精美绝伦的地面上的场景时，时间仿佛停止。
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One should do," he says, "what archers do when attempting to reach a distant target, namely, aim your bow high, knowing that the force of gravity " will bring the arrow down."
他说：，“一个人应该做的是，模仿伟人所为,当试图达致遥不可及的目标时，意即将目标设高，明了重力会将,射出的箭吸回地面“
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It's an image of ascent toward heaven, from which the boy returns.
这是接近天堂的的样子，从那里，这个孩子又回到地面。
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It's a material force that his rhetoric challenges and relies on, gives him a means of getting off the ground, and a means of always getting back to it, too.
这是他的修辞所挑战的并且依赖的物质力量，这种力量给他离开地面的方法，也给他回到地面的方法。
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I think it's clear, the position of the object with respect to the ground, this vector is the same as the position of the object with respect to the plane, plus the position of the plane with respect to the ground.
我觉得很明显,物体相对于地面的位置,这个矢量等于,物体相对于平面的位置矢量,加上物体相对于地面的位置矢量
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It is an uncontrollable mystery "on the bestial floor": on the floor, on the bottom, on the ground, where the animals dwell.
这是个不可控制的神话,发生在兽性的地面上：,在地上，最低处，地面上，那儿是动物栖息的地方。
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If you call that your origin, your y0 will be 0, but ground will be called -15.
如果你取楼顶为原点,你的y0就等于0,但是地面就要标记为-15
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breaking down maybe, crashing, coming back to earth like Icarus, the over-reacher.
可能会损坏它，彻底的，回到地面,像伊卡洛斯一样。
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You are pushing down with the weight mg, and the floor has got to be pushing up with the mg, because the spring is not going anywhere.
你向下的作用力是重力 mg,然后地面向上的支持力也是 mg,因为弹簧现在根本没动
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But the standard origin for everybody is the foot of the building.
不过标准的原点就是地面
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It says you are on the ground on two occasions.
在两个点你是在地面上的
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That'll say the velocity of the object with respect to the ground, the velocity of the object with respect to the plane, the velocity of the plane with respect to the ground.
可以得到物体相对于地面的速度,物体相对于平面的速度,物体相对于地面的速度
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When you have a velocity in the moving plane frame and you want to find the velocity on the ground, you should add to every object in the plane the velocity of the plane with respect to the ground.
当你在运动的飞机上运动,然后你想找到相对于地面的速度,你就应该给每个物体加上,飞机相对于地面的速度
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