An Exploratory Study of Immunotherapy Combined With Anlotinib and Chemotherapy in Perioperative Treatment of LAGC

* 1. Main objective: to evaluate the pathological complete response (pCR) of gastric cancer after local advanced COVID-19 infection by two kinds of immunotherapy combined with Anlotinib Hydrochloride Capsules and neoadjuvant chemotherapy. * 2. Secondary objective: to evaluate the major pathological response (MPR), disease-free survival (DFS), objective response rate (ORR), R0 resection rate (R0 resection rate) and safety of two kinds of immunotherapy combined with Anlotinib Hydrochloride Capsules and neoadjuvant chemotherapy for gastric cancer after local advanced COVID-19 infection。