Yaml语法错误：服务myphpadmin必须是映射而不是字符串yaml

Question

wordpress:
 image: wordpress
 links:
 depends_on:
   - wordpress_db:mysql
 ports:
   - "8080:80"
wordpress_db:
 image: mariadb
 environment:
      MYSQL_ROOT_PASSWORD:edureka
phpmyadmin:
 image: corbinu/docker -phpmyadmin
 links:
 depends_on:
   - wordpress_db:mysql
 ports:
   - "8181:80"
  environment:
       MYSQL_USERNAME:root
       MYSQL_ROOT_PASSWORD:edureka