由于船体严重腐蚀，这艘货轮被认为不适航了。

The cargo ship was declared ___unseaworthy due to severe hull corrosion.

这艘老旧的渔船因为发动机故障和船体漏水而被宣布不适航。

The old fishing boat was declared ___unseaworthy due to engine failure and leaking hull.