后背: the back (human anatomy), the back part of sth...
摇: to shake, to rock, to row, to crank...
涵义: content, meaning, connotation, implication...
地震: earthquake...
专家: expert, specialist...
书记: secretary (chief official of a branch of a socialist or communist party), clerk, scribe...
锲而不舍: to chip away at a task and not abandon it (idiom); to chisel away at sth, to persevere, unflagging efforts...
