当营销策略发生了重要变化的翻译：When marketing strategy has undergone important changes 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

When the marketing strategy has undergone important changes

When marketing strategy has undergone important changes

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When important changes have occurred in the marketing strategy

When marketing strategy has undergone important changes