人口: population, people...
遍: one time, all over; all around; everywhere...
效率: efficiency...
气氛: atmosphere, mood...
研制: to manufacture, to develop...
邮政: postal service, postal...
防盗: to guard against theft, anti-theft...
领队: to lead a group, leader of a group, captain (of sports squad)...
仲裁: arbitration...
幸亏: fortunately, luckily...
