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Dynamic program is to solve much phase the mathematical method of decision-making problem, it can divide the moving process of a certain system for a certain number of level, use principle of optimality to build basic equation, make target function is achieved best, seek an optimum solution.

动态规划是解决多阶段决策问题的数学方法，它可以将某个系统的运行过程分为若干个阶段，利用最优化原理建立基本方程，使目标函数达到最优，求出最优解。

The so-called "science" is sum of natural knowledge of the wisdom of organisms in a certain historical period and a certain space-time coordinates in the phase,"science" is relative, not absolute!

所谓"科学"，是智慧生物在一定的历史阶段和一定的时空坐标中对自然认知的阶段性总结，"科学"是相对的，不是绝对的！

With this angular momentum, according to the three laws of planetary motion proposed by Kepler, a certain amount of angular momentum will create a certain path of movement.

根据喀卜勒的行星三大定律，一定的角动量会产生一定的运动轨道。

For certain channel conditions, when the SNR targets achieve a certain value (the trade-off point), the spectrum efficiency can not be improved further and approaches to a limit.

对某一信道条件，当目标信噪比达到一定的数值后，频谱利用率不再发生变化，趋近极值。

I recognize there is a certain presumptuousness —a certain audacity —to this announcement.

我承认这一声明有一点自以为是—甚至有些狂妄。

On a certain day at a certain hour, we will pull into the station.

在一个特定的日子一个特定的时间里，我们将进站。

On a certain day at a certain hour,we will pull into the station.

在某一天的某一时刻，我们将会进站。

Under normal circumstances, the skin elastic fiber with the rectus abdominis to maintain a certain degree of elasticity, and the limits of freedom in a certain flexibility.

正常情况下，皮肤弹性纤维与腹直肌保持一定的弹力，并在一定限度内自由伸缩。

Sour natural gas contains a certain amount of water,which should be reduced to a certain degree in its processing.

天然气中含有一定的水份，在天然气加工过程中，必须将其中的水份脱除到一定的程度。

There is a certain credibility and a certain sensationalism in the way we present data.

现在我们的资料，有一定信誉和该方法必然追求轰动效应。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷