Definition: If a computer or machine is down, it is temporarily not working. Level: C1
网络整个上午都宕机了。
The network was ___down all morning.
如果其他部门使用在线系统，它似乎会宕机一段时间。
If other departments use the online system, it seems to be ___down for a while.
服务器因维护而宕机。
The server is ___down for maintenance.
