In this paper,the author discusses the order of an element of periodic groups and free groups,studies the order of an element of the additive group of a ring and establishes the concept of the characteristic number of a ring,and gives two popularizations of the order of an element of groups:the order of an element to a subgroup and the order of an element of semigroups.
讨论了周期群与自由群的元素的阶,研究环的加群的元素的阶并建立环的特征数的概念。
A kind cf invariant compact group action on completely positive maps of C+ algebras can determine the isomorphism between these C" algebras.
证明了一类紧群在C+代数的完全正映射上的不变群作用可以决定C+代数间的同构。
On the Application of Compact Group in the Complete Maps of C~* Algebras;
紧群在C~*代数的完全映射上的应用
Stay close behind me in the crowd.
在人群里你要紧紧地跟着我.
Hang on to my arm in the crowd.
在拥挤的人群里紧紧抓住我的胳膊。
I threaded my way through the crowd with the dog at my heels.
我从人群中挤过去，狗紧紧地跟着我。
A large group of people gathered or crowded closely together; a multitude.
群众聚集或紧拥在一起的一大群人
The crowd pressed together so tightly that we could hardly breathe.
人群紧紧挤在一起使我们连气也喘不过来。
The detective threaded his way through the crowds, always keeping the suspect in view
侦探从人群中挤过去，紧紧地盯着那个可疑的人。
the stood in a tight little group; hair in tight curls; the pub was packed tight.
站成一个紧凑的小群体；紧紧卷着的头发；酒馆挤满了人。
a crowd atwitter with expectation.
在期待中紧张不安的人群
A tense silence had settled over the waiting crowd.
在等候的人群中有一种紧张的寂静感.
The panic-stricken crowd rushed to the emergency exit.
惊恐万状的人群朝紧急出处口跑去。
The young soldier, however, was a quick thinker.
人群都很紧张，负责的军官面色苍白。
Intervention of occupational stress in different occupational groups;
行为干预对不同人群职业紧张的作用
Freeze on to that bag, or someone in the crowd may snatch it.
紧紧抓住手提包，否则人群中可能会有人把包抢去。
a close-knit family; close-knit little villages; the group was closely knit.
关系亲密的家庭；联系紧密的村庄；这群人关系紧密。
That thief was running off with an angry crowd at his heels.
那小偷在前面跑，一群愤怒的人在后面紧追不舍。
The thief ran off with an angry crowd at his heel.
那小偷在前面跑，一群愤怒的人在後面紧追。
The thief ran off with an angry crowd at his heels.
那小偷在前面跑, 一群愤怒的人在後面紧追.