Hxen.com's tips：Every day persisted can learn English well!-->■Learn English Everyday■
rejoice– v. to feel or show that you are very happy
pandemic– n.the fast spread of an infectious disease over a very large area or the whole world
disappointment– n. a feeling of unhappiness or sadness because something did not happen as expected
location– n. a place or position
sanitize– v. to make something free from dirt or infection
app– n.(computer) short for a computer application
