Upwards of a billion stars in our galaxy have burnt up their internal energy sources, and so can no longer produce the heat a star needs to oppose the inward force of gravity.
在我们的星系中，超过10亿颗恒星已经耗尽了它们的内部能量来源，因此无法再产生恒星所需的热量来对抗向内的引力。
Walking keeps you upright and enlists gravity to keep acids from splashing up the esophagus.
散步可以帮助你直立和获得地心重力的作用，去防止胃酸上溅到食道上。
Tom looked up in her face with just a perceptible twinkle peeping through his gravity.
汤姆抬起头来，看着她的脸，严肃地眨了眨眼睛。
After a year of research, the team came up with a gravity-driven hand-washing machine successfully.
经过一年的研究，该团队成功研制出了一种重力驱动的洗手机。
On Earth, gravity helps a plant's stems and roots to find "up" and "down".
在地球上，重力有助于植物的茎“向上”生长，根“向下”生长。
The moon's gravity is a sixth as strong as the earth's, so Chang'e-4's experiment was a test: would the earth plants know which way was up on the moon?
月球的引力是地球引力的六分之一，所以嫦娥四号的实验是一个测试：地球上的植物能知道月球上哪个是向上的方向吗？
It also throws up problems for the birth of stars in galaxies, with as much feedback energy needed to prevent their creation as gravity provides to help them form.
而这样的宇宙模型也在恒星的起源方面面临着一些问题：就像引力在协助构成恒星一样，反馈的能量也在阻碍他们的构成。
Each of the four fundamental forces (gravity, electromagnetism, and the strong and weak nuclear forces) has a kind of theoretical knob that can be turned up or down to change its strength.
四种基本力(重力，电磁力，强作用力和弱作用力)都有一个理论把手，调节这东西可以改变力的强度。
Normal swells, known technically as gravity waves, are created by wind pushing the surface of the sea up and gravity then pulling it down, causing it to bounce.
一般的波浪，技术上被成为重力波，是由于风推动着海洋表面上升而后又在重力的作用下被拉向下方，这便会导致海水的回弹。
Atmospheric gravity waves form when buoyancy pushes air up, and gravity pulls it back down.
当浮力把空气向上推，而重力又把它向下拉的时候，就会形成大气的重力波。
But the most famous response of his was to say "I am not going to try to make up any explanation of how gravity works why it does what it does."
当然这其中也不乏他著名的真知灼见，“我不想编造关于万有引力是如何运作，为何产生，究竟是何物的任何解释。”
While it is easy to measure the effects of gravity on grander planetary or even galactic scales, the force's weakness has meant its detailed nature has been difficult to observe up until now.
虽然要想测量到巨大到行星甚至银河系规模的引力效应是轻易的。但是到目前，要做到精确观测还是不够，因为作用力太弱。
And then, when you keep adding force — which we will do by gravity, - we will just hang weights on it — then it starts to bend over, up to a point here which we call the elastic limit.
然后，继续增加力-，受到重力的影响，不断给它悬挂重量-，然后它开始弯折，到这里的某一点，我们称之为弹性极限。
If it waits another fraction of a second, the force of gravity will overtake inertia, causing the column to break, the liquid to fall back into the bowl, and the cat's tongue to come up empty.
如果它再等上几分之一秒，重力的作用将压倒惯性而破坏液柱，液体会落回碗里，而小猫的舌头则扑了个空。
Since gravity is a conservative force, and since my force is always the same in magnitude except in opposite direction, ; it doesn't matter how I move in; it will always come up with the same answer.
既然重力是恒定的，我施加的力在大小上,不变，就是方向不同，无所谓我怎么移动;,答案总是,相同的。
While it's up there, it will be experiencing no gravity, so if it had an apple on it, the apple wouldn't fall.
那里没有重力，所以如果树上有苹果，也不会掉下来。
By the looks of these photos, some people have stuck with that magical feeling and grew up with Levitation skills.They are able to fly by employing the power of mind to defy the laws of gravity.
看着下面这些照片，让人产生一种这些人天生就会飞的错觉，他们能够利用心灵的力量战胜重力。
While it's up there, it will be experiencing no gravity, so if it had an apple on it, the apple wouldn't fall, " said Sellers.
那里没有重力，所以如果树上有苹果，也不会掉下来。
A hypothetical cube world, however, would feature six square faces and you'd only encounter up/down gravity toward the centers of these regions.
然而，在一个假设的立方体世界里，会有6个正方形表面。你会朝向这些区域的中心承受向上或向下的重力。
Just as loop quantum gravity breaks up space into tiny "building blocks", CDT assumes that space-time is split into tiny building blocks - this time, four-dimensional chunks called pentachorons.
只不过圈量子引力理论把空间分为微小的“构建模块”，而CDT假设空间-时间不是分成微小的构建模块—而是叫做pentachorons的四维的小块。
You cannot walk up against gravity.
你无法逆着重力运动。
You can also try changing your position: Get up on all fours, or squat; the force of gravity might shift the baby's head.
你也可以尝试改变你的姿势：起床四肢着地，或者蹲着；让重力作用在婴儿的头部。
As you read the words printed on this page, as your eyes distinguish the black squiggles on white paper, as you feel gravity anchoring you to the planet, wake up.
在你读印在这一页上的文字时，在你的眼睛分辨出白纸上黑色的花体字时，在你感到地心引力把你固定在地球上时，醒醒。
You might even consider delivering in this position (no matter what kind of labor you're having), since it opens up the pelvis and USES gravity to coax baby down.
你甚至可以考虑用这种方式生产(无论你的阵痛是哪种情况)，因为它能打开骨盆并利用重力帮助胎儿出生。
When NASA first started sending up astronauts, they quickly discovered that ballpoint pens would not work in zero gravity.
在美国太空总署第一次派太空人上太空时，他们很快发现圆珠笔无法在零重力的情况下工作。
They were sent up with early space flights to see how human cells coped with zero gravity and exposed to radiation to test the effects of nuclear weapons.
这些细胞随着早期的航天飞行被送上太空，用以观察人类细胞在失重的状态下如何存活，并将它们暴露在辐射中用以测试核武器的影响。
You see the white stuff because this was the direction of gravity so it ended up here and there's some here.
你们看白色物质,因为这是重力的方向,所以白色物质都到了下面。
On our spherical Earth, gravity pulls "down" us toward the planet's center of mass. So on a flat surface, we naturally stand up straight.
在我们地球上，重力会把我们拉向星球的质量中心，因此在平坦的地表，我们自然站得很直。
Perhaps the best news is that the mayhem in Monterrey has at last forced Mexico’s politicians and business leaders to face up to the gravity of the threat.
或许最好的消息，就是蒙特雷的暴力犯罪事件另墨西哥政客和商人终于直面这一无时不在加剧的威胁。
Perhaps the best news is that the mayhem in Monterrey has at last forced Mexico’s politicians and business leaders to face up to the gravity of the threat.
或许最好的消息，就是蒙特雷的暴力犯罪事件另墨西哥政客和商人终于直面这一无时不在加剧的威胁。
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