但是，网络学习过程如果缺乏正确理论指导，就会导致学习效率不高。

But, web-based learning process if lacks the correct theory instruction, can cause the study efficiency not to be high.

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当前作文教学的根本问题是缺乏正确的理论指导。

The fundamental problem that faces our composition teaching is lack of proper theoretical guidance.

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然而，由于缺乏正确的规划理论指导和积极有效的实施措施，许多城市有关该地区的绿地规划建设仍然长期处于落后状态。

But now, for the sort of plan theory and implementation measure, the plan and construction has been in backward for a long time.

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