三个年轻人看到一个闪亮的物体下降到地面。
数学家（1564-1642）；论证了不等重的物体下降速度相同；完善了折光式望远镜使他能够获得许多新的发现。
Italian astronomer and mathematician; demonstrated that different weights descend at the same rate; perfected the refracting telescope that enabled him to make many discoveries (1564-1642).
如果我透过窗户看你，物体在一些轨道上，有上升和下降，也有水平运动。
If I see you through the glass, the object is going on some trajectory, which has got both up and down and horizontal motion.
是的，当然是错的，但其错误程度就如同重力与物体的下降的速度成比例一样。
Of course it is, but only as false as it is that gravity accounts for how quickly objects fall.
但有时，即使当系统在没有相互重叠时，这一对恒星的整体亮度也会明显下降——暗示着，还有第三个物体围绕着这一对恒星作轨道运转。
Sometimes, however, the system's overall brightness dipped even when the stars were not eclipsing each other-hinting at the presence of a third body orbiting the binary pair.
对，物体当然下降，但为什么？
当人或啮齿类动物体重下降10%或更多时，瘦素的水平就会急剧下降，引发一连串的生理变化，促使体重回升。
When humans (and rodents) lose 10% or more of their body weight, leptin falls rapidly and sets off a cascade of physiological changes that act to put weight back on.
我们看到由于某些生物体大规模下降，海洋中食物链供给方式正在变化。
We are seeing changes in the way food chains work in the ocean because we are seeing massive declines in some sort of organisms.
向尘埃和小水滴这种小物体只下降很短距离就失去它们的大部分加速度。
Small objects such as dust particles and water droplets fall only small distances before losing most of their acceleration.
我想象第一个人，大声提出这个问题，可能得到这样的回答，多么愚蠢的问题，物体当然下降。
And I imagine the first person who articulated the question aloud probably met with the response saying, "What a stupid question. Of course things fall down."
在冬季，当这些物体的温度下降到0C时。
In winter, when the temperature of these objects falls below 0 c.
国外还有资料报道说，睡前饮酒会伤害视网膜，阻碍视网膜产生感光视色素，使其在黑暗环境中辨别物体的能力下降。
There is also information abroad reported that bedtime drink will hurt the retina, retinal hampered as a photosensitive pigment, so in the dark environment decline in the ability to identify objects.
充填有小物体(填料)使上升蒸气与下降液体紧密接触的分馏塔或吸收塔。
A fractionating or absorber tower which is filled with small objects (packing) to effect an intimate contact between rising vapor and falling liquid.
正如我们都知道的那样，轻重物体以相同的速度下降，除非是空气阻碍它们。
As we all know now, heavy objects and light objects fall at the same speed unless air holds them back.
那些动物体重明显下降，瘦多了，简直是憔悴不堪。
Much as I hope I may gain weight, (yet) I am still as thin as before.
那些动物体重明显下降，瘦多了，简直是憔悴不堪。
Much as I hope I may gain weight, (yet) I am still as thin as before.
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