POS

英文释义

n a radioactive metallic element that is similar to tellurium and bismuth; occurs in uranium ores but can be produced by bombarding bismuth with neutrons in a nuclear reactor
n a noncommissioned officer in the Navy or Coast Guard with a rank comparable to sergeant in the Army
n a European river; flows into the Adriatic Sea
n an independent agency of the federal government responsible for mail delivery (and sometimes telecommunications) between individuals and businesses in the United States