1. 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。

2. From this the captain was able to piece together all the information that had come to light.
    据此，船长可以将所有的那些已经搞清的材料拼凑起来。