1N-COUNT; N-TITLE 沙皇 In former times, the tsar was the king of Russia. 沙皇
2N-COUNT 特使 A particular kind of tsar is a person who has been appointed by the government to deal with a particular problem that is affecting the country. 特使
...the former New York police chief who was appointed as 'drug tsar' by Bill Clinton.
被比尔·克林顿任命为“反毒特使”的前纽约警察局局长
He promised to appoint an AIDS czar to deal with the disease.