渺小: minute, tiny, negligible, insignificant...
举足轻重: to play a critical role (idiom), influential...
值: value, (to be) worth, to happen to, to be on duty...
事迹: deed, past achievement, important event of the past...
玩耍: to play (as children do), to amuse oneself...
往往: usually, in many cases, more often than not...
搭建: to build (esp. with simple materials), to knock together (a temporary shed), to rig up...
意味着: to signify, to mean, to imply...
告辞: to say goodbye, to take one's leave...
心情: mood, frame of mind...
