When can't I use entertainment software?

You can't use entertainment software on April 4. According to relevant data, on April 4, 2020, in order to express deep condolences to the martyrs and deceased compatriots who died in the fight against the COVID-19 epidemic, a national mourning activity was held on April 4, and the people of the whole country observed a three-minute silence on the morning of that day. Cars, trains and ships whistle and air defense alarms sound.