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By exploiting the important properties of robot dynamics, the second strategy removes the requirement of a priori bound on parametrer uncertainty and weakens the restriction on external disturbance. The only requirement is to know an upper bound of the norm of inertia matrix, which is not necessary to be the smallest.

第二种算法利用机器人固有的结构特性，减弱了目前已有文献对未建模扰动的限制，它不要求预先知道机器人结构参数的不确定范围，仅要求已知实际惯量矩阵范数的一个上界。

We said that simplicity considerations are not a priori, but this is not really necessary to the argument.

我们认为'简单性考虑'不是先天的，但这不是真正必要于论证的。

In a virtual environment the investment necessary to set up a retail outlet on the Internet is much smaller than the investment for paper catalogues.

在一个虚拟的环境，互联网上一个零售店的投资远小于纸质目录的投资。

Nevertheless it is necessary for the strategic direction of the war to make a rough sketch of its trends.

然而给战争趋势描画一个轮廓，却为战略指导所必需。

Do you think if it is necessary to give publicity to environmental protection in such a scenic spot as Xitang ?

10您认为有必要在西塘这样的旅游区开展环保宣传么？

In fact, the corner of our room had a secret door leading to a small staircase which would allow someone to escape the Inn if necessary.

事实上，我们房间的角落里有一扇暗门，它通向楼梯间，以便人们在必要的时候逃离。

It is necessary for us to draw on assistance from a broad spectrum of people who are involved in Japanese culture.

对我们来说，吸引更为广泛的人们参与到日本文化事业中来，是非常必要的。

Hence, to jointly promote balanced and orderly world economic development, all countries, the major economies in particular, should adopt responsible economic policies, introduce necessary economic restructuring, keep a relatively stable exchange rate of the major reserve currencies and prevent trade protectionism.

世界各国特别是主要经济体，不仅要采取负责任的经济政策，进行必要的经济结构调整，维护主要储备货币汇率的相对稳定，防止贸易保护主义，而且要加强宏观经济政策的对话，特别是要加强在一些涉及世界经济发展全局和各国共同利益的重大问题上的协调，以共同促进世界经济平衡有序发展。

It's necessary to develop a suite of aerophotogrammetry flight management system based on GPS and GIS.

有必要建立基于全球定位系统和地理信息系统的航空摄影测量飞行管理系统。

In order to learn english well,a variety of practice is necessary.

要学好英语，大量的练习是必要的。

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