第14行第21列出错 . 但是我错过了什么?

network:
  version: 2
  renderer: networkd
  ethernets:
    enp0s3:
     dhcp4: no
     addresses: [192.168.202.765/24]
     gateway4: 192.168.207.254
     nameservers: kostserver
       addresses: [8.8.8.8,8.8.4.4]