The development of large aircraft has a large investment, long cycle, and many uncertain factors. It is an extremely complex system project, facing many risks and difficulties, and the task is very arduous. To produce safe and reliable large aircraft with market competitiveness and realize industrialization It requires us to do a lot of hard and detailed work. What is the author most likely to emphasize next? ['Investment and cycle for developing large aircraft.', 'Engineering complexity in developing large aircraft.', 'How to balance the revenue and expenditure of large aircraft and ultimately achieve profitability.', 'How to do well the organized implementation of developing large aircraft.']