Decline in population growth will be studied as an alternative development scenario 我们会透过不同的假设人口增长情况，探讨人口下降的问题。
2.
Hong kong might experience a decline in population as did london and new york in the late 1980s and early 1990s 香港或会如1980年代后期的伦敦及1990年代初期的纽约般，出现人口下降趋势。
