中国在欧洲的经济扩张速度加快。
其中一个难点就是要在扩张速度和产品及服务的多样化之间找到平衡。
One key challenge is striking the right balance in the pace of expansion and diversification of product and service offerings.
在暗物质向外扩张的过程中，其扩张速度由于周围物质的引力而减缓。
As it moves outward, it's slowed down by the gravity of matter all around it.
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