1. From a heavy gun was raised, the captain realized that the ship must have been a cruiser.
    船长根据捞上来的一门重炮，判断出这条船大概是一艘巡洋舰。

2. From a heavy gun that was raised, the captain realized that the ship must have been a cruiser.
    从捞起的一门大炮来看，船长认为那艘船一定是艘巡洋舰。