呢個問題係重要嘅 因為中國喺 1997 年 黃河足足乾涸咗九個月 造成農業嚴重損失 對社會帶嚟損失同禍害
This is an important issue because in 1997, when the Yellow River dried up for nine months, it caused severe losses to agriculture and caused losses and disasters to society