他将身体的重心从一只脚挪到另一只脚上。
结婚后，大多数女人会把重心从工作转移到家庭上。
After getting married, most women would shift their focus from work to family.
工作的重心放在个人上，通过调整他们的各种表现，努力在这次比赛中多缩短百分之一秒，在那场比赛中多出一毫米。
The focus is on individuals, tweaking performances to squeeze an extra hundredth of a second here, an extra millimetre there.
他语重心长，但年轻的听众却没有领会。
养老金问题在1985年春不是他思考的重心。
The pension issue was not at the forefront of his mind in the spring of 1985.
这是近年来已变成关注重心的又一件令人担忧的事。
This is another worry that has come to the foreground in recent years.
以前的重心是大坝、道路和桥梁等大型基础设施项目，现在开始转向直接改善国家基础服务的项目。
Where previously it had concentrated on the big infrastructure projects such as dams, roads and bridges, it began to switch to projects which directly improved the basic services of a country.
哈德菲尔德的书的重心与海利的书不同。
The center of gravity of Hadfield's book differs from Highley's.
事实上，母亲的生活重心就是家庭。
尤其是对重心的更加自然的安排。
And especially a more natural arrangement of the centres of gravity.
不舒适的鞋子会影响身体的重心。
你们看，重心处在，悬挂点的下方。
And look at this. The center of mass is way below my suspension point.
还有一点是工程师们的工作重心。
你没有移动，你处于质量重心。
但重心是低于绳子的，所以没有危险。
But the center of mass is below the rope, and so there is really no danger.
我们怎样计算，重心速度呢？
你需要将你努力的重心从自身转向上帝。
It means that you shift the focus of your effort from yourself to God.
所以物体的重心，经常处于悬挂点之下。
So the center of mass will always find itself below the point of suspension.
对摆来说，重心在这里。
我们会做同样的计算,在质量重心体系中。
Now I'm going to do the same calculation in the center-of-mass frame.
但几代人做的重心在不同的方向。
重心肯定是这里某处。
音乐越来越成为我生活的重心。
它还有一个特性，质量重心的特性。
And now comes another unique property of the center of mass.
重心肯定,在这条线上某个位置，我让它平衡。
The center of mass must now be somewhere here. I balance it here.
看到质量重心了吧？
美国不只是偏离了它的重心。
这就是重心速度。
这就是重心速度。
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