New words：

socialism /ˈsəʊʃəlɪzəm/ n. 社会主义

Sample Sentences：

We are fighting for the great cause of socialism.
Marx and Engels founded the theory of scientific socialism.
The main purpose of socialism is to make people's life better.

cause [kɔz] n. (支持或为之奋斗的)事业，目标，思想

found [faʊnd] v. 建立；创建；创立；成立

New words：

communism ['kɒmjunɪzəm] n. 共产主义；共产主义制度

the Soviet Union 苏联 [ˈsoʊviet]

Sample Sentences：

We say that socialism is the first stage of Communism.
I will fight for the cause of communism as long as I live.
People talked about communism when they mentioned the Soviet Union.

cause [kɔz] n. (支持或为之奋斗的)事业，目标，思想

New words：

communist ['kɑmjənɪst]
n.共产主义者；共产主义的支持者；共产党党员
adj.共产主义(者)的；共产党(员)的

the Communist Party 共产党
the Communist Party of China 中国共产党
the Communist Party of Soviet Union 苏联共产党 [ˈsoʊviet]

Sample Sentences：

A communist is someone who believes in communism.
The Communist Party of China was founded in 1921.
The Communist Party of China (CPC) has helped China achieve great achievements.

party [ˈpɑrti] n. 政党；党派
found [faʊnd] v. 建立；创建；创立；成立
communism ['kɒmjunɪzəm] n. 共产主义；共产主义制度

New words：

drawback [ˈdrɔˌbæk] n. 缺点；不利条件；弊端

Sample Sentences：

Everything has its drawback.
Living in a small city has benefits and drawbacks.
He felt the apartment's only drawback was that it was too small.

apartment [əˈpɑrtmənt] n. 公寓；房间；公寓楼

New words：

converse [ˈkɑnˌvɜrs] v. 交谈
conversation [ˌkɑnvərˈseɪʃ(ə)n] n.（非正式）交谈，谈话；会话

Sample Sentences：

The students converse with each other in english.
The two scientists conversed about their new research.

I'm learning English conversation.
The main topic of conversation was Tom's new teacher.