"租让制合同" can be translated into English as "concession contract" or "lease-concession agreement".
"Concession contract" is a commonly used term in international business and legal contexts, referring to an agreement where one party (the concessionaire) is granted the right to operate, manage, or develop a specific asset, project, or area by another party (the grantor), often in exchange for fees, royalties, or other considerations.
"Lease-concession agreement" is a more specific term that combines elements of both leasing and concession arrangements, emphasizing the dual nature of the agreement.
In the context of "租让制合同" (which typically involves the leasing or concessioning of state-owned assets or resources to private entities), "concession contract" is usually a suitable and widely accepted translation.