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以下是最重要的行动：
below is a list of the most significant actions:
Last Update: 2016-12-04
Usage Frequency: 1
Quality:
硬煤是最重要的燃料，褐煤也极为重要。
hard coal is the most important fuel, and lignite is also important.
Last Update: 2016-12-04
Usage Frequency: 3
Quality:
