所有制结构单一，产业结构不尽合理；
The system of ownership is single and the industrial structure is not reasonable.
造成我国风险投资资金不足的主要原因在于资金结构单一。
The main reason cause lack of venture capital funds lies in the single fund structure.
然而爱荷华州同质性高且地理结构单一，因此它的模式不可复制。
But Iowa is a homogenous and geographically simple state, and its system was not copied.
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