The ship was buried, beyond retrieval, at the bottom of the sea.

船已葬身海底，无法打捞。

《牛津词典》

DRIS is a hierarchical distributed Internet information retrieval system. It can provide a set of information resources integration solution from the bottom layer to application layer.

域内资源整合系统是一种分层的分布式互联网信息检索系统，其提供了从底层到应用层的一整套互联网信息资源整合利用方案。

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First, we proposed the retrieval method of characteristic variety direction of shallow ocean under water bottom topography, and proved its direction was in accordance with SAR images characteristic.

首先提出了浅海水下地形特征变化方向的提取方法，证明了其提取的方向与SAR图像特征基本一致。

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