(product development) project

長期間: extended period of time

work through, address, grapple with, deal with

project (planned endeavour)

extended period of time

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend

distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend

he; boyfriend

空き缶: empty can (container)

unnecessary to ask