Learn about（了解） images & containers（docker核心技术）
Docker Engine（引擎，发动机） provides the core Docker technology that enables images and containers（启用镜像和容器）. As the last step in your installation, you ran the Engine docker run hello-world command. With this one command, you completed the core tasks to using Engine. The command you ran had three parts.（这个命令包含了3个部分）
container_explainer.png
