求翻译：通过三年的努力，进一步夯实近年来中国石油安全环保形势稳步好转的基础，实现“中国石油安全环保形势进一步持续稳定好转的阶段性目标：是什么意思？

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Through three years of efforts to further solidify environmental situation in recent years, China's oil security has steadily improved, and the basis for "China's oil security environmental situation has further improved steadily in the stage goals:

Through the efforts of three years, further consolidating in recent years China's oil security basis for steadily improving the environmental situation to realize "further sustained and steady improvement the environmental situation of Chinese Petroleum security milestones:

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