delay in land acquisition for the construction of the hub, security issuesandcumbersomecustoms and clearanceprocedures. daccess-ods.un.org daccess-ods.un.org 达尔富尔混合行动迟迟未能建立战略燃 料储备,主要是由于枢纽建设用地的收购延迟、安全问题、繁琐的海关和通关手续。