海底地形地貌能表现海洋世界重要的空间信息，也是常规光学和电磁手段难以探测的水下区域。
Seafloor terrain and relief can express spatial information of oceanic world, and they are also seafloor field that are difficult to be detected by optics and electromagnetism.
美国和日本的防务官员解释说，这可能是探测东海至太平洋路线的海底地形和搜集情报。
S. and Japanese defense officials interpreted it as a possible effort to map and gather intelligence about routes from the East China Sea to the Pacific.
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