US president, Joe Biden, unveiled a national strategy to stop the coronavirus while issuing a warning that the pandemic was likely to cost another 100,000 lives over the next month.

Biden encouraged Americans to be vigilant about wearing masks and he said that the simple precaution could save about 50,000 lives. He pointed out that wearing a mask was the best thing to do and it was more important than the vaccines.

The distribution of coronavirus vaccines in the US has faced delays, and Biden¢¥s officials have criticized the administration of the previous president, Donald Trump. Biden wants to stabilize the supplies of COVID-19 drugs and provide quick and fair vaccine distribution. International travelers arriving in the US will soon be required to show a negative COVID-19 test before departure and to quarantine on arrival.

Difficult words: unveil (to announce publicly), vigilant (watchful), precaution (a measure taken beforehand to prevent something dangerous or unpleasant from happening).