If an arm is stretched forward under water resistance is increased and a reaction force back ward is developed both of which would contribute to negative acceleration.
如果手臂在水中是向前伸展则阻力会随之增加而向后方的反作用力也会出现，二者都会产生负加速度。
Hand at her mouth she stared while Melanie packed a fresh towel against his shoulder pressing it hard as though she could force back the blood into his body. but the towel reddened as though by magic.
她捂着嘴注视着里面，看见媚兰又把一条毛巾放在他的肩上，使劲压，好像能把流出来的血压回去，但是这条毛巾马上又红了，像变戏法一样。
We believe that a force of about one hundred pounds was needed to pull the string all the way back on a long bow.
我们认为，拉动长弓上的弓弦大约需要100磅的力。
They pushed and tried to force the whale back into the water, but it was no use.
他们推着，试图迫使鲸鱼回到水里，但没有用。
Women's labor force participation has slipped back to the level it was at in the late 1980s.
女性的劳动参与度已回落至20世纪80年代末的水平。
They pushed him in order to force him back to the end of the line.
他们推搡着他，迫使他回到队尾。
What interests me, indeed, is knowing and describing the force that leads them back toward the common path of illusion.
诚然，我所感兴趣的是，了解和描述那种引导他们回到共同的幻想之路的力量。
If you insist on keeping the word private, you force the experience of women back into darkness.
如果你坚持要在私下里讨论流产，那你是在强迫女性重新退回到暗无天日的生活之中。
They often buy only the cheapest available items — which are typically more likely to break and force them to go back to buy another, costing more time and money in the long run.
他们常常买最便宜的东西，这些便宜货常常在用到一半的就坏掉，然后他们不得不在回来买一个新的，最终花费了更多的时间和钱。
If you feel like some greater force keeps knocking you back down every time you try to get ahead, you're not imagining it.
你可能没想到，当你尝试生长时，如果你感觉到每次都有一股强大的力压倒你。
Chewing on a piece or two of gum, it seems, helps force fluids back into the stomach and flood the esophagus with alkaline saliva, neutralizing acids that cause the characteristic burning sensations.
嚼一两片口香糖可能会使胃液回流入胃并使口腔分泌碱性唾液冲刷食道，中和胃酸，缓解由胃酸引起的“烧灼感”。
The force is always opposing the direction of increasing potential energy, so the force will drive it back and so that's why we call this a stable equilibrium.
力一直和势能，增加的方向，相反，作用力会将其推回，那就是为什么称它，稳定平衡的状态。
While he has no college debt (his grandparents paid all his tuition and board) many others do, and that helps force them back home.
而他没有很多人背负的助学贷款(祖父支付了他所有的学费和生活费)，贷款迫使他们回到家里。
An exhale is sent down through each four corners of the foot, pressing it firmly onto the ground and an equal force is now pressing back up and through the front thigh, opening the front of the hips.
呼气时，顺着脚的四个方向慢慢向下俯身，稳稳地压在地面上，然后用力将后背沿着前大腿推起，打开胯部。
The Japanese tendency towards self-restraint, or jishuku, is back in force.
日本人倾向的自律精神，或者用日语说是“自肃精神”，开始回归主流。
Indian Air Force and U.S. Air Force airmen walk back from the dropzone after parachuting from a U.S. C-130J during Cope India-09 on October 19.
在10月19日的Cope India-09演习期间，印度空军和美国空军飞行员从美军C-130J上跳伞后的降落区域步行回来。
Jaw muscles can provide about 200 pounds of force to bring the back teeth together for chewing.
颚肌可提供约200磅(90.72公斤)的力量，以便臼齿合拢咀嚼。
If the system is perturbed by some force and pushed in a new direction, it usually moves back toward equilibrium quickly.
如果系统受到某种力量的干扰，被推往一个新的方向，它通常会迅速移回到平衡状态。
That is, for every force applied to an object or surface, that object pushes back with equal force.
也就是说，对于任一物体或表面施加的作用力，该物体或表面必会产生相同的反作用力。
Books like his may help force the atrocities, and the debate, back to the surface.
此类书籍或许能促使这种虐政公之于众，使争论回到问题表面。
Well, the ground just pushes right back, supplying a force forward and up that propels the skaters into a glide or jump, depending on the particulars of the force they applied.
于是，冰面反推回去，提供了前进和上升的力量，推动选手滑翔或跳跃，而力量细节取决于选手们原作用力的特殊性。
By dumping the session, we force any continued access to first be revalidated by logging back in.
通过转储会话，我们强制任何再续访问首先都要通过重新登录重新验证。
By meditation and prayer, I can escape that dark, destructive force and win my way back to the beauties of the world and the joy of God.
在冥思与祈祷中，我可以避开这种罪恶的破坏力，重新回到美丽的世界，重享上帝给我的喜乐。
If things don't work out and you head back to the work force, your story is what will ensure your reentry.
如果所做的事情没能成功，你需要重新去找工作，你的经历也会确保你能重新找到工作。
If things don't work out and you head back to the work force, your story is what will ensure your reentry.
如果所做的事情没能成功，你需要重新去找工作，你的经历也会确保你能重新找到工作。
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