time capsule
柯林斯词典
1. N a container holding articles, documents, etc, representative of the current age, buried in the earth or in the foundations of a new building for discovery in the future 时空胶囊; 内存具有时代特征的文章、文件等的密藏容器，埋在地下或新建建筑物地基下供后人发现并了解现代情况
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