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单词 Orbit space
释义

Orbit space

原声例句
Crash Course 天文篇

Several of these have been caught in the act by orbiting space probes.

其中一些已经被轨道太空探测器逮个正着。

时代周刊 (Time)

At any moment, there are more than 500,000 pieces of space debris orbiting Earth.

任何时候,都有超过50万个太空碎片在绕地球运行。

VOA Special 2018年10月合集

In August, the crew found a hole in a Russian Soyuz capsule docked to the orbiting space station.

今年8月,宇航员在对接国际空间站的俄罗斯联盟号太空舱发现了一个洞。

迷人历史

They planned for an orbiting space station that had the power to incinerate  any target at will.

他们计划建造一个能够随意焚烧任何目标的轨道空间站。

经济学人(汇总)

China began construction of an orbiting space station with the launch of Tianhe (" harmony of the heavens" ), the first of three planned modules.

随着核心舱“天和”(寓意“诸天和谐”)发射成功,中国开始了轨道空间站的建设,这是三个计划模块中的第一个部分。

TED-Ed(视频版)

Within a few decades, the moon may be bustling with mining operations, research stations, and tourist routes alongside a construction yard under an orbiting space port.

几十年之内,月球上可能会布满采矿作业、研究站和旅游路线,旁边是轨道太空港下的建筑场。

中文百科

群作用 Group action

(重定向自Orbit space)
给定一个等边三角形,通过把所有顶点映射到另一个顶点,绕三角形中心逆时针 120°旋转“作用”在这个三角形的顶点的集合上。

数学上,对称群描述物体的所有对称性。这是通过群作用的概念来形式化的:群的每个元素作为一个双射(或者对称作用)作用在某个集合上。在这个情况下,群称为置换群(特别是在群有限或者不是线性空间时)或者变换群(特别是当这个集合是线性空间而群作为线性变换作用在集合上时)。一个群G的置换表示是群作为一个集合的置换群的群表示(通常该集合有限),并且可以表述为置换矩阵,一般在有限的情形作此考虑-这和作用在有序的线性空间基上是一样的。

英语百科

Group action 群作用

(重定向自Orbit space)
Given an equilateral triangle, the counterclockwise rotation by 120° around the center of the triangle maps every vertex of the triangle to another one. The cyclic group C3 consisting of the rotations by 0°, 120° and 240° acts on the set of the three vertices.
In the compound of five tetrahedra, the symmetry group is the (rotational) icosahedral group I of order 60, while the stabilizer of a single chosen tetrahedron is the (rotational) tetrahedral group T of order 12, and the orbit space I/T (of order 60/12 = 5) is naturally identified with the 5 tetrahedra – the coset gT corresponds to which tetrahedron g sends the chosen tetrahedron to.

In mathematics, a symmetry group is an abstraction used to describe the symmetries of an object. A group action formalizes the relationship between the group and the symmetries of the object. It relates each element of the group to a particular transformation of the object.

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更新时间:2025/6/23 7:21:11