When Libyan evacuees, they sing the national anthem to determine whether they are from China or Vietnam.

At that time, many Chinese workers were working abroad, and their passports were properly kept in the factory, not in the hands of individuals (usually the sheds were not complete, so the more expensive things were generally kept by the company, and suddenly there was a war, and everyone fled and took them out of the company's safe before they could prove their nationality), but the war gradually spread behind them, and many shells exploded nearby. These compatriots must be allowed to cross the border into safe areas as soon as possible. It suddenly occurred to the embassy staff that they could sing the national anthem to prove that they were from China.

At that time, there were 45,000 people in China, few Vietnamese in Africa, and the total number of African countries was less than 45,000 (450 is hard to estimate).