People tour the National Mall in Washington, D.C., the United States, on Nov. 8, 2020. The U.S. Centers for Disease Control and Prevention (CDC) on Sunday reported a record-high average daily increase of COVID-19 cases at nearly 100,000, a new milestone since the onset of the pandemic in the country. (Photos: Xinhua)

People tour the National Mall in Washington, D.C., the United States, on Nov. 8, 2020. The U.S. Centers for Disease Control and Prevention (CDC) on Sunday reported a record-high average daily increase of COVID-19 cases at nearly 100,000, a new milestone since the onset of the pandemic in the country.

People visit the Lincoln Memorial on the National Mall in Washington, D.C., the United States, on Nov. 8, 2020. The U.S. Centers for Disease Control and Prevention (CDC) on Sunday reported a record-high average daily increase of COVID-19 cases at nearly 100,000, a new milestone since the onset of the pandemic in the country.

People visit the Lincoln Memorial on the National Mall in Washington, D.C., the United States, on Nov. 8, 2020. The U.S. Centers for Disease Control and Prevention (CDC) on Sunday reported a record-high average daily increase of COVID-19 cases at nearly 100,000, a new milestone since the onset of the pandemic in the country.

People visit the Lincoln Memorial on the National Mall in Washington, D.C., the United States, on Nov. 8, 2020. The U.S. Centers for Disease Control and Prevention (CDC) on Sunday reported a record-high average daily increase of COVID-19 cases at nearly 100,000, a new milestone since the onset of the pandemic in the country.

People tour the National Mall in Washington, D.C., the United States, on Nov. 8, 2020. The U.S. Centers for Disease Control and Prevention (CDC) on Sunday reported a record-high average daily increase of COVID-19 cases at nearly 100,000, a new milestone since the onset of the pandemic in the country.

People tour the National Mall in Washington, D.C., the United States, on Nov. 8, 2020. The U.S. Centers for Disease Control and Prevention (CDC) on Sunday reported a record-high average daily increase of COVID-19 cases at nearly 100,000, a new milestone since the onset of the pandemic in the country.

People tour the National Mall in Washington, D.C., the United States, on Nov. 8, 2020. The U.S. Centers for Disease Control and Prevention (CDC) on Sunday reported a record-high average daily increase of COVID-19 cases at nearly 100,000, a new milestone since the onset of the pandemic in the country.

People tour the National Mall in Washington, D.C., the United States, on Nov. 8, 2020. The U.S. Centers for Disease Control and Prevention (CDC) on Sunday reported a record-high average daily increase of COVID-19 cases at nearly 100,000, a new milestone since the onset of the pandemic in the country.

People tour the National Mall in Washington, D.C., the United States, on Nov. 8, 2020. The U.S. Centers for Disease Control and Prevention (CDC) on Sunday reported a record-high average daily increase of COVID-19 cases at nearly 100,000, a new milestone since the onset of the pandemic in the country.

People tour the National Mall in Washington, D.C., the United States, on Nov. 8, 2020. The U.S. Centers for Disease Control and Prevention (CDC) on Sunday reported a record-high average daily increase of COVID-19 cases at nearly 100,000, a new milestone since the onset of the pandemic in the country.

People tour the National Mall in Washington, D.C., the United States, on Nov. 8, 2020. The U.S. Centers for Disease Control and Prevention (CDC) on Sunday reported a record-high average daily increase of COVID-19 cases at nearly 100,000, a new milestone since the onset of the pandemic in the country.

People tour the National Mall in Washington, D.C., the United States, on Nov. 8, 2020. The U.S. Centers for Disease Control and Prevention (CDC) on Sunday reported a record-high average daily increase of COVID-19 cases at nearly 100,000, a new milestone since the onset of the pandemic in the country.