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Update part3.md (#4119) 

* Update part3.md

* Update part3.md
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Wang Jie 2017-08-11 01:55:22 +08:00 committed by Misty Stanley-Jones
parent 17544f7862
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get-started/part3.md
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@ -39,7 +39,7 @@ must go one level up in the hierarchy of a distributed application: the
- **Services** (you are here)
- Container (covered in [part 2](part2.md))
## Understanding services
## About services
In a distributed application, different pieces of the app are called "services."
For example, if you imagine a video sharing site, it probably includes a service
@ -57,7 +57,7 @@ service in the process.
Luckily it's very easy to define, run, and scale services with the Docker
platform -- just write a `docker-compose.yml` file.
## Your first `docker-compose.yml` File
## Your first `docker-compose.yml` file
A `docker-compose.yml` file is a YAML file that defines how Docker containers
should behave in production.