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以下是一些英文词源、变化形式和相关单词的示例，每个都包含10个单词或短语：

1. 词源：拉丁语

变化形式：名词（词根“-bus”），形容词（词根“-bus”），动词（词根“-bus”加上不同的后缀）

相关单词：

a. busines(s) - 商业，贸易

b. businessman(n) - 商人，企业家

c. businesslike - 商业化的，有条理的

d. busi(e)st - 忙碌的，繁忙的

e. busi(e)ness - 事情，事务

f. busi(e)nessman(n) - 商人，商人阶层

g. busi(e)nesswoman(n) - 妇女商人

h. bureau(r)y - 官僚的，官方的

i. bureaucracy - 官僚制度，官僚作风

j. bureaucrat - 官僚主义者

2. 词源：希腊语

变化形式：名词（词根“-phos”），形容词（词根“-phos”加上不同的后缀）

相关单词：

a. photo(s) - 照片，相片

b. photosphere - 照片球体

c. photoelectric - 光电的

d. photo(e)genic - 有光能的，有照相功能的

e. photo(e)lithography - 照相印刷术

f. photo(e)graphy - 照相术，摄影术

g. photo(e)luminous - 发光的，照明的

h. photo(e)nomical - 光学原理的

i. photo(e)nomic - 经济学的，经济学的术语

j. photo(e)nomist - 经济学家，经济学研究者

3. 词源：古英语

变化形式：名词（词根“-fela”加上不同的后缀）

相关单词：

a. feudalism - 封建制度，封建主义

b. feudal-archy - 封建制度下的政治体系

c. feudal-lord - 封建领主，贵族

d. feudal-vassal - 封建封臣，臣属

e. feudal-nobility - 贵族阶层，贵族等级

f. feudal-tribute - 封建贡赋，封建赋税

g. feudal-serf - 农奴，佃户

h. feudal-patrimony - 封建世袭财产，封地遗产

i. feudal-feeling - 对封建制度的情感认同

j. feudal-bondage - 封建束缚，封建奴役

这些例子只是英文词源和变化形式的冰山一角。要了解更多内容，可以查阅相关的语言学书籍或在线资源。

常用短语8个：

1. by the way 顺便问一下

2. all over the world 全世界

3. at the same time 同时

4. get along well with 与...相处得好

5. make a decision 做决定

6. keep an eye on 留意

7. take a break 休息一下

双语例句：

1. By the way, where did you go for your vacation? 顺便问一下，你度假去了哪里？

2. All over the world, people speak different languages. 全世界，人们说着不同的语言。

3. At the same time, we need to work hard and study hard. 同时，我们需要努力工作并努力学习。

4. If you want to get along well with your roommate, you should communicate more. 要想与室友相处得好，你应该多沟通。

5. It"s time to make a decision about what to do next. 是时候做出下一步决定了。

6. Keep an eye on your child while they are playing outside. 在孩子在外面玩的时候，要留意他们。

7. Take a break and relax for a while. 休息一下，放松一下。

英文小作文：

The Importance of Communication

Communication is essential in any relationship, whether it"s personal or professional. It"s important to keep in touch with family and friends, share ideas and opinions, and build trust through open and honest communication. When it comes to work, effective communication is crucial for teamwork and collaboration. It helps to identify problems and find solutions together, which leads to better outcomes and increased productivity. In addition, communication plays a vital role in maintaining a healthy lifestyle. Staying connected with others allows us to share our experiences and seek support when we need it most. It"s also essential to take breaks and relax from time to time, which can be achieved through taking a walk, listening to music, or simply chatting with friends and family. Therefore, it"s essential to prioritize communication and make it a habit in our daily lives.