分支和标签是廉价的(常数时间)行动。
喔，当然，可能没那么，但是现在是常数级了，这是常数时间的访问。
Wow, OK, maybe not so wow, but this is now constant. This is constant time access. So I can do searching in constant time which is great.
数据库可以为每个节点分配顺序号，这样就知道每个节点的位置，可以在常数时间内比较两个节点的文档顺序。
The database can assign sequence Numbers to each node so that it knows the position of each node and can compare the document order of two nodes in constant time.
我们有一个理论，M理论或弦理论，认为自然界的常数，是钉在“场”里的，它们随时间和空间而变化。
And we have one theory, m theory or string theory, suggests that the constants of nature are pegged to fields that can vary across space in time.
它很小，在任何小段的时间范围，它大体上是常数。
It's small. And over any small time period, it's roughly constant.
我来把更一般的形式，写出来吧，在一维空间中，位置和速度，作为时间函数的，一般形式，这里的加速度是一个常数。
I now would like to write down, in most general form the equation for the position and the velocity as a function of time for a one-dimensional motion whereby the acceleration is constant.
这种时钟能够帮助认出物理常数如何随着时间所作的极为微小的变化。
Such clocks could help spot tiny changes in physical constants over time.
在那几十亿光年以外的地方，回头看数十亿年时间，我们现在知道，这个精细结构常数并没有任何超过1/100000。
Over billions of light years and looking back billions of years in time, we now know that the fine-structure constant hasn't changed any more than about .001 percent.
但研究人员说，支持alpha常数的变化性质的证据是模糊不清的，因为它可能是由于时间的变化，或者由于穿过了宇宙的不同部分。
But the evidence supporting the alpha constant's variable nature was ambiguous, because it could also be due to a variation over time, or across different parts of space, researchers said.
换句话说，任意时刻A物质的浓度等于初始浓度，减去常数乘以时间。
In other words, the concentration of at any time is given by the initial concentration, t minus the rate constant times time.
研究人员总结说，既然如果alpha常数随时间变化的话，这两种结果就会自相矛盾，那么该常数就必然在宇宙中不同的位置存在不同的值。
Since those two results would contradict each other if the alpha constant varied with time, the constant must take on different values in different areas of the universe, the researchers concluded.
唯一可能且合理的解释是：一个被称之为“精细结构常数”或α的物理常数，在临近启程的那段时间产生了一个不同的值。
The only feasible explanation was that a constant of physics called the fine structure constant, or alpha, had a different value near the time the light started its journey.
请注意此处的加速度，是一个常数，不随时间变化而变化，不过速度是变化的。
So notice that the acceleration is constant in time, is not changing but the velocity is changing.
我的访问时间现在是常数级别，这个非常的棒，但是我也付出了代价，不得不使用更多的空间，在整数的例子中。
I have constant time access which is great, but I paid a price, which is I had to use up some space.
光速常数实质上支撑着我们对于空间、时间和因果关系的理解。我们都相信因在果之前的事实。
The constancy of the speed of light essentially underpins our understanding of space and time and causality, which is the fact that cause comes before effect.
变更膜盒阻尼时间常数。
但是时间常数越低，允许通过的水平加速度噪声就越多。
But the lower the time constant, the more horizontal acceleration noise will be allowed to pass through.
受灯泡的时间常数限制，本电路只能低频工作。
This circuit is restricted to low frequency operation by the lamp time constant.
然后C有一个很小的二次方的上升，接着指数的上升直到你预期的饱和,那C约等于A0乘以1减,的负k2乘以时间次方，e，to，the，minus，k2，times，time。,速率常数k2长时间地起主导作用。
And then C has a very small quadratic rise, followed by the exponential rise to saturation that you'd expect. So C is approximately a0 times one minus e The rate constant k2 dominates the long times.
串入的电阻还增加了测量时的RC时间常数。
Any series resistance will also increase the RC time constant of the measurement.
时间是个常数，但对勤奋者来说却是个变数。
Time is a "constant", but for a hard-working person it is a "variable".
时间是个常数，但也是个变数。勤奋的人无穷多，懒惰的人无穷少。
Time is a constant, but it's also a variable. Hardworking people are infinitely many, and those who are lazy are infinitely less.
为了获得预期的准确度，就必须等待几倍于时间常数的时间。
To achieve the desired accuracy, it may be necessary to wait several time constants.
分析了直流电路中电感和时间常数对直流电弧熄灭的影响。
The affect of inductance and time constant to DC arc extinguishing in DC circuits was analyzed.
该系统利用电加热法对热电偶的时间常数进行在线校验，同时还可进行温度测量。
Time constant of thermocouple is checked on line with an electric heating method, and with the same thermocouple temperature is measured.
本文提出了一种基于热电偶响应曲线时间常数的动态温度估计方法。
The paper states a dynamic temperature estimating method based on time constant of the response curve of thermocouple.
本文提出了一种基于热电偶响应曲线时间常数的动态温度估计方法。
The paper states a dynamic temperature estimating method based on time constant of the response curve of thermocouple.
应用推荐