3d如何准确计算下期和值

简介：Downstairs in the inpatient department of the Respiratory Building, Su Can was walking on the road with his hands in his pockets. There was a dark starry night above his head. The moonlight was leaning on the platform in front, and the bamboo shadows were swaying. It was very quiet. The hospital was always very quiet, except for the occasional ambulance siren.