They called a submarine an iron fish and a small bomb thrown by hand a potato.

他们把潜水艇叫做“铁鱼”，把手榴弹叫做“土豆”。

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In the film adapted from a true story of a blackmailing case, a policeman nicknamed "Old Fish" who has no experience of removing bombs is ordered to defuse the threat of a bomb.

电影根据一起真实的勒索案改编，一名绰号叫做“老鱼”的警察被指派去拆除炸弹，而他没有任何拆弹的经验。

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