在计划经济时期为保证原油生产，不计费用；

To ensure the produce in the period of planned economy, the cost is not calculated.

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在计划经济时期，实际履行原则扮演着重要的角色。

The principle of specific performance played a important role in the era of planned economy.

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经济手段主要是收取排污费，这又带着明显的计划经济时期色彩。

Furthermore, the main economic means of regulating the environmental pollution is "the polluter ejection fee", and this is in the color of planned economy.

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