小卒: foot soldier, minor figure, a nobody, (chess) pawn...
镇定: calm, unperturbed, cool...
停顿: to halt, to break off, pause (in speech)...
盛: flourishing, vigorous, magnificent, extensively...
惨重: disastrous...
芭蕾: ballet (loanword)...
辛苦: exhausting, hard, tough, arduous, to work hard, to go to a lot of trouble, hardship(s)...
口令: oral command, a word of command (used in drilling troops or gymnasts), password (used by sentry)...