Black started to laugh, a horrible, mirthless laugh that filled the whole room.

布莱克开始大笑，一种可怕、没有欢乐的大笑充满了整个房间。

Around six o'clock in the evening the doorbell rang and Mrs Black started screaming again.

晚上六点左右门铃响了，布莱克夫人又尖叫起来。

At around six o'clock in the evening the doorbell rang and Mrs Black started screaming again.

晚上六点左右门铃响了，布莱克夫人又尖叫起来。

With a roar of rage, Black started toward Snape, but Snape pointed his wand straight between Black's eyes.

布莱克怒吼一声，向斯内普扑去，但是斯内普的魔仗直指布莱克的双眼之闯。

That's because recovering from a complete collapse, called a " black start" of the power grid, is an immense technical challenge.

这是因为从被称为电网“黑启动”的完全崩溃中恢复是一项巨大的技术挑战。

If anything goes wrong during a black start and frequecy deviates too far, breakers will trip to protect the equipment and you have to start all over.

如果黑启动期间出现任何问题并且频率偏差太大，断路器将跳闸以保护设备， 您必须从头开始。