dual-levelCOCA²⁸⁰¹³⁶⁺⁵BNC²³⁶²¹³⁺¹ 基本例句 🌏双层级别；双层面 The new dual-level operational regime, which combines family operation with cooperative operation of rural households, is the effective arrangement of agricultural system. 家庭经营与农户合作经营相结合的新型双层经营体制是行之有效的农业制度安排； cnki