Number (4): Everything in this space must add up to 4. The answer is 4-4, placed horizontally.
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与此同时，能源结构本身也在剧变。依赖化石能源将面临越来越高的碳成本和政治风险；而风电、光伏等绿色能源，虽然前景广阔，却受限于其不稳定性，以及“风光资源”与“算力需求”在地理上的错配。