It is difficult to calculate stresses of supporting structures under mooring equipments of a certain cableship because they bear complex forces when we try to design supporting structure.
The new ship cut her cable and slipped into the water.
新船砍缆下水。
《新英汉大辞典》
3
And of course, if you have an earthquake, or if someone is, you know, hitting your cable with a boat, or a ship, then you simply have bad luck, " he said.