1. The Karen had been sailing in a convoy to Russia when she was torpedoed by an enemy submarine.
    卡伦号是护送船只到俄国去的，途中遇到敌人潜水艇的鱼雷袭击。

2. The Karen had been sailing in a convoy to Russia when she was torpedoed by an enemy submarine.
    "卡伦"号当年在为其他船只护航驶往俄国的途中突然遭到敌方潜水艇鱼雷的袭击。

3. A burst of activity associated with the laying of submarine cables soon confirmed the Challenger´s observation that many parts of the ocean were two to three miles deep,
    铺设海底电缆的热潮很快证实了"挑战者"号的观察结果：海洋中很多地方可深达两三英里，