一个钢制的拱形结构给钢管提供保护,构成完整的电缆芯线.
cable core 电缆芯线.下面还有一段话,显然是说该拱形结构是电缆芯线的一个组成部分,用以提高电缆芯线机械强度,以抵抗海下7000米的高压.
This vault provides a high level of protection and a very good mechanical behaviour during sea-going operations, allowing the URC2 cable to be laid in very deep water, to depths of 7000 metres.