最底的垫板，不需要弹簧保护装置。
表里突然弹出一节弹簧来。
这钢丝弹簧绕得很均匀。
外层空间甚至会剥夺你用来固定弹簧的东西吗?
Does outer space even rob you of something to which you can anchor a spring?
那个剧场的门是弹簧门。
她在一个五金店停了一停，给她的新自行车架买弹簧索。
She stopped at a hardware store to buy bungee cords for her new bike rack.
我们安装了小磨头和弹簧。
她在床单下面铺了一个弹簧床垫。
我们怎样才能测量出弹簧常数呢？
这是回复力，就像弹簧上的那一样。
你可以把每一张汽泡纸看作一个弹簧。
这说明了什么，一个硬弹簧？
这是弹簧储存的能量，它转化为动能。
That was the potential energy of the spring that was converted into kinetic energy.
然后，它把我的弹簧床垫的一角嚼了。
如果振幅过大，会让弹簧，永久损伤。
If you make the amplitude too large, then you get permanent deformation of the spring.
系统中有两辆车,我将它们用弹簧连接。
We have a system here of two cars which I connected by a spring.
在闭合高度有限时，弹簧可以调整行程。
Designed for limited shut height applications, the spring is available with various stroke lengths.
弹簧门被打开后可以自动弹回。
The swing door will resile automatically after it has been opened.
你也可以,从弹簧处于张力情况下开始算。
You could already start when the spring is already under tension.
看起来很像弹簧是不是？
记得吗，一维的弹簧，周期和振幅，无关？
Remember the one-dimensional spring that we had a period which was independent of the amplitude?
用弹簧测张力，很常见。
We often do that — we measure with springs the tension in strings.
对弹簧来说也是一样。
没有必要从,这个点也就是弹簧松弛处开始。
You don't have to start necessarily at this point where the spring is relaxed.
只要薄断面的弹簧箱。
我们叫它无质量弹簧。
这是弹簧在松弛阶段。
这是存进弹簧的能量。
这是存进弹簧的能量。
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