such as:
1 line: 肺具有广泛的呼吸面积,成人的总呼吸面积约有100m2(3 亿-7.5 亿肺泡),在呼吸过程中,


becomes 2 lines after extraction:
2
肺具有广泛的呼吸面积,成人的总呼吸面积约有100m(3 亿-7.5 亿肺泡),在呼吸过程中,

since y coordinate of char '2' is smaller than other chars.


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with best regards

daniel