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1. The team's performance has significantly improved since the new coach took over.
自从新教练上任以来，球队的表现有了很大的提高。
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2. The weather has changed dramatically since yesterday.
自昨天以来，天气发生了巨大的变化。
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3. The economy is undergoing a significant change due to technological advancements.
由于技术进步，经济正在经历一场重大的变化。