毕恭毕敬: reverent and respectful; displaying full courtesy; extremely deferential; in humble reverence; showing great politeness; showing great respect; with the utmost deference
鞠躬: 1.(弯身行礼) bow 短语和例子深深地鞠一个躬 make a deep bow; bow low; 相互鞠躬行礼 exchange bows; 弯腰鞠躬 bow from the waist; 告别时的鞠躬 a parting bow; 他对我彬彬有礼地鞠了一躬。 he made a very civil bow to me. 主人鞠躬迎接客人进屋。 the host