 History Based on Zuozhuan usages of hun and po in four historical contexts, Yü (1987:370) extrapolates that po was the original name for a human soul, and the dualistic conception of hun and po "began to gain currency in the middle of the sixth century" BCE.
<clarity>  History Based on Zuozhuan usages of hun and po in four historical contexts, Yü (1987:370) extrapolates that po was the original name for a human soul, and the dualistic conception of hun and po "began to gain currency in the middle of the sixth century" BCE.
 History Based on Zuozhuan usages of hun and po in four historical contexts, Yü extrapolates that po was the original name for a human soul, and the dualistic conception of hun and po "began to gain currency in the middle of the sixth century" BCE.