The Bateleur occurs throughout the savanna and open woodland regions of Africa south of the Sahara.
短尾雕分布于非洲撒哈拉以南的稀树草原和开阔林地区域。
Open region
英语例句库
原声例句
CRI在线 2022年6月合集
He added that China is willing to work with South Korea and Japan to build a safer and more open region.
他补充表示，中方愿同韩方日方一道，建设一个更安全、更开放的地区。
VOA Standard 2014年5月合集
Authorities hope that opening up the ethnic regions of Burma to trade will increase job opportunities. Many living there now have few employment options.
当局希望，开放缅甸少数民族区域贸易将增加就业。但是目前居住在此的很多人几乎没什么工作机会。
大商业时代
Thus the harvester, under McCormick's comprehensive selling plans, did as much as the homestead act in opening up this great farming region.
因此，在 McCormick 的综合销售计划下，收割机在开辟这个伟大的农业区方面所做的工作与宅基地一样多。
Listen to this 2 英语中级听力
I am convinced that research in space will open up unguessed regions of medical knowledge and give us a vast range of new therapies.
我相信太空研究将开辟医学知识的未知领域，并为我们提供范围广泛的新疗法。
美国历史
Marquette and Joliet, who opened the Lake region, and La Salle, who in 1682 had gone down the Mississippi to the Gulf, had been followed by the builders of forts.
开辟湖区的马奎特和若利埃特，以及 1682 年沿密西西比河下到海湾的拉萨尔， 都紧随堡垒的建造者之后。
中文百科
开集 Open set
（重定向自Open region）
开集是指不包含自己边界点的集合。或者说，开集包含的任意一点的充分小的邻域都包含在其自身中。
例如，实数线上的由不等式
规定的集合称为开区间，是开集。这时候的边界为实数轴上的点2和5，如由不等式
，或者
规定的区间由于包含其边界，因此不能称之为开集。
开集的概念一般与拓扑概念是紧密联系着的，通常先公理化开集，然后通过其定义边界的概念。（详细请参照拓扑空间）
英语百科
Open set 开集
（重定向自Open region）
In topology, an open set is an abstract concept generalizing the idea of an open interval in the real line. The simplest example is in metric spaces, where open sets can be defined as those sets which contain an open ball around each of their points (or, equivalently, a set is open if it doesn't contain any of its boundary points); however, an open set, in general, can be very abstract: any collection of sets can be called open, as long as the union of an arbitrary number of open sets is open, the intersection of a finite number of open sets is open, and the space itself is open. These conditions are very loose, and they allow enormous flexibility in the choice of open sets. In the two extremes, every set can be open (called the discrete topology), or no set can be open but the space itself (the indiscrete topology).
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