Hxen.com's tips：Every day persisted can learn English well!-->■Learn English Everyday■
Which of these countries has the largest population? Pakistan, Nigeria, Brazil or Russia. Though it's far from the largest country on this list, Pakistan has the largest population with more than 233 million people.
And unless they had back up power generators, they're lights went out on Saturday night. Blackouts aren't unusual in Pakistan but what the nation saw over the weekend was its most widespread power shutdown since 2015.
An engineering problem at one plant in southern Pakistan reportedly caused the nation's other ones to shut down. Because electricity can be unreliable here, all of the nation's major airports as well as many of its hospitals and some of its homes do have back-up generators.
Though residents say there was some very long lines at gas stations where people waited to get fuel for those generators. By dawn on Sunday morning, Pakistan's energy minister said power had come back on for major parts of the capital city of Islamabad. But there were still large parts of Karachi, Pakistan's biggest city, where power was still out early Sunday.
