不少农民虽然懂得智力投资的重要性，但是限于经济条件，他们首先要培养男孩子，因为他们认为，男孩子是家庭中最稳定的成员。
Many farmers are fully aware of the importance of intellectual investment on their children.
稳定的复杂性有什么限制条件，必要条件？
What are the boundary conditions, the requirements, for stable complexity?
并在生产因素保持相对稳定的条件下，据此模型对河北省棉花生产进行规划性预测，为生产的规划与决策提供科学信息。
The model was used to predict the cotton yield in Hebei province under the conditions of relative stability and to provide scientific information for production planning and decision making.
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