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Each flock of butterflies lays eggs in the same states.
出自-2014年6月听力原文
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Each generation in a cycle lays eggs at a different place
出自-2014年6月听力原文
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Space Policy Directive-3 lays out general guidelines for the United States to mitigate the effects of space debris and track and manage traffic in space.
2019年6月六级真题（第二套）阅读 Section C