困惑: bewildered, perplexed, confused, difficult problem, perplexity...
届时: when the time comes, at the scheduled time...
概论: outline, introduction, survey, general discussion...
缺少: lack, shortage of, shortfall, to be short (of), to lack...
贵宾: honored guest, distinguished guest, VIP...
亲生: one's own (child) (i.e. one's child by birth), biological (parents), birth (parents)...
调整: to adjust, adjustment, revision...
组长: group leader...
对立: to oppose, to set sth against, to be antagonistic to, antithetical, relative opposite, opposing, diametrical...
纯粹: pure, unadulterated, purely, completely...
