[ˌɔ:ltər ˈi:ɡəʊ]

noun

1. (n.) another aspect of oneself; a second self

2. (n.) a person's secondary or alternative personality, typically one that is considered to be distinct from their real or original personality

alter-ego是一个拉丁语词汇，意为“另一个自我”，通常指的是人们内心中的另一个自己，也可以理解为人们具有的第二性格或者替代性格。

Alter-ego is a Latin word that means "another self," which typically refers to another side of oneself, or a second or alternative personality.

例句：

1. He was living a secret life with his alter-ego, pretending to be someone he was not.

他和他的alter-ego过着秘密生活，假装成了别人。

2. Many artists use their alter-egos as a way to express themselves in a different way.

许多艺术家利用他们的alter-egos来以不同的方式表达自己。

3. She created an alter-ego for herself online, using it as an escape from her real life.

她在网上创造了一个alter-ego，用它来逃避现实生活。

4. The superhero's alter-ego was just an ordinary person with no special powers.

这位超级的alter-ego只是一个普通人，并没有特殊能力。

5. The character in the book had an alter-ego who represented their inner desires and fears.

书中的角色有一个alter-ego，着他们内心的欲望和恐惧。

同义词及用法：

1. Doppelganger (n.) - an apparition or double of a living person

2. Other self (n.) - another aspect of oneself; a second self

3. Persona (n.) - the aspect of someone's character that is presented to or perceived by others

4. Shadow (n.) - a person's alter-ego or unconscious mind

5. Split personality (n.) - a condition in which someone has two or more distinct personalities

编辑总结：

alter-ego是一个常用的词汇，通常用来指代人们内心中的另一个自己或者第二性格。它可以用来描述人们隐藏的一面，也可以用来表示人们创造的虚拟角色。在文学作品、电影和音乐中，alter-ego经常被用来表现人物复杂的内心世界。除了上述提到的同义词外，还有许多其他词汇可以代替alter-ego，如second self、other self、persona等。总之，alter-ego是一个非常有意思且多样化的词汇，在不同场合都能够得到灵活运用。