In this paper we discuss the generalized Liénard system and give several sufficient conditions to guarantee the origin is the local center.
给出广义Li啨ｎａｒｄ系统的奇点为局部中心点的判定条件 。
The conditions of a local center for a Liénard system d~2xdt~2+f(x)dxdt+g(x)=0 are discussed.
首先通过计算线性近似系统特征值的方法,给出了奇点O为局部中心点的判定条件。
In addition to forward and backward rotation, center of rotation and rotation angle in certain procedures can be set up.
除向前和向后旋转以外，旋转中心点和旋转角度在某种程序上可设置。
Click on the center dot to rotate the hand around the action line.
点击中心圆点，沿着作用线旋转手臂。
To cause to turn around or as if around a central axis;revolve or rotate.
旋转使盘旋，使仿佛绕着一中心轴旋转；旋转，回旋
Mark from point A round CF to point B at site mark.
从A点开始标,沿着前中心线旋转样板到B点。
To turn around or as if around a central axis;revolve or rotate.
旋转围绕或仿佛围绕一中心轴而转动；盘旋，旋转
Capable of or exhibiting rotation about a central axis.
旋转的能够绕中心轴旋转的，或正在绕中心轴旋转的
Output shaft when the swing set in the center of rotation on the trip-down, design may also need to set rotation angles and movements itinerary.
出力轴在摆动时可设定在旋转行程的中心点上停动，也可依设计需要设定旋转角度和升降行程。
Batch output shaft in sub-degrees, set in the center of rotation on the trip-down, can be set rotation angle and increased capacity.
出力轴在间歇分度时，可设定在旋转行程的中心点上停动，也可设定旋转角度和升高能力。
Arc Rotate Selected
弧形旋转于所有物体；圆形旋转选择物；选择对象的中心旋转视图
Arc Rotate SubObject
弧形旋转于次物体；选择次对象的中心旋转视图
circular movement,esp that of a line of soldiers pivoting on one end
旋转运动;（尤指横排士兵以一端为中心的）旋转
To revolve rapidly about a center or an axis.
转动绕着一中心或轴飞速旋转
To cause to move around an axis or a center; cause to rotate or revolve.
使旋转，转动使绕着一个轴或中心移动；使转动或旋转
neck pivot point (P point)
颈部转动中心点（P点）
Drilling, milling, and turning were performed on “machining centers” and “turning centers”.
制造、打磨、旋转等过程都由加工中心和旋转中心完成。
a plane curve traced by a point circling about the center but at ever-greater distances from it.
一个点围绕一个中心旋转但距中心的距离永远变大而形成的一个平面曲线。
binary star (two stars that revolve around a common centre)
双星（环绕一共同中心旋转的两颗星）.
a planet turning on its axis;
行星以自己的轴为中心旋转;