RecruitingPhase 3Drug trialA Study to Compare the Efficacy and Safety of LY01015 and Opdivo® Combined Respectively With Chemotherapy in Advanced or Metastatic Esophageal Squamous Cell CarcinomaThis is a randomized, double-blind, multicenter, Phase 3 study to compare the efficacy and safety of LY01015 and Opdivo®(Nivolumab Injection)combined respectively with fluorouracil plus cisplatin in participants with unresectable advanced, recurrent or metastatic previously untreated esophageal squamous cell carcinoma.