undersea

undersea life; undersea cameras.

海面下生命；海底摄象机

First underseas telephone cable, England to France.

第一根海底电话电缆连接英国和法国。

of the long-distant undersea optical cable, it is necessary to detect the delitescent fault in earliest time.

摘要为长途海底光缆运行可靠性，需要尽早发现潜在故。