In the meantime, the submarine has to face the changeable and dangerous ocean environment factors.

同时潜艇在行驶过程中还要面对复杂多变、危机四伏的各种海洋环境。

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In the meantime, the submarine has to face the changeable and dangerous ocean environment factors.

同时潜艇在行驶过程中还要面对复杂多变、危机四伏的各种海洋环境。

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