OK, so for this guy, domain of definition, which is plane minus the origin with the origin removed is not simply connected.
好滴，目前这里，在有定义的区域里，减掉原点，即移去原点，就不是单连通的。
Give a definition about area vector of a polygon on the plane and its formula, area formula of a polygon can be sought by it.
给出平面上多边形的面积矢量的定义及公式，并应用它求出多边形的面积公式。
We present the definition and study content of chemistry philosophy in the paper, and we also analyze the theoretical problem of chemistry on the philosophical plane.
论述了化学哲学的定义及化学哲学的研究内容，并对化学科学理论性问题作了哲学分析。
The autofocusing system can automatically search the focal plane by evaluating the image definition.
调焦系统可以通过对成像清晰度的评价来自动搜索到成像最清晰位置。
The essay discusses the definition of context and its dynamic features from three planes—logic plane, psychological plane and background plane in the framework of context.
从语境框架中的逻辑层、心理层和背景层三个平面来探讨话语的语境意义及其动态特征。
Definition: travelling long distances over land and sea rather than by plane, especially because you are concerned about the environment or because you want to spend time enjoying the journey.
定义：在陆地和海上进行长途旅行而非乘飞机，尤其是因为你关心环境或者因为你想慢慢享受旅行。
Definition: travelling long distances over land and sea rather than by plane, especially because you are concerned about the environment or because you want to spend time enjoying the journey.
定义：在陆地和海上进行长途旅行而非乘飞机，尤其是因为你关心环境或者因为你想慢慢享受旅行。
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