哪个命令会在 docker/whalesay 容器中运行 cowsay，显示 Ahoy, Docker？
docker/whalesay
cowsay
Ahoy, Docker
docker run docker/whalesay cowsay "Ahoy, Docker"
docker run "Ahoy, Docker" docker/whalesay
在主机上直接运行 cowsay "Ahoy, Docker"，不使用 Docker。
cowsay "Ahoy, Docker"
docker pull docker/whalesay