一半是海水一半是火焰
[yī bàn shì hăi shuĭ yī bàn shì huŏ yàn]
The phrase 'Half is seawater, half is flame' refers to the novel 'Half Is Sea Water, Half Is Flame' by Bi Shumin. In a broader sense, it symbolizes contradictions and extremes coexisting, often used to depict dramatic changes in circumstances.