2. A 9.1-percent drop in the annual average density of fine particulate matter (PM2.5) was seen in 74 major cities.
3. n. 紧张，拉紧，血统
4. Discipline watchdogs have also tightened management of Party and governmental officials so that the number of newly escaped fugitives dropped from 101 in 2014 to only four last year, CCDI figures show.