Given the task definition and input, reply with output. In this task, you are given a sentence or phrase in Xhosa. You must translate it to English in a way that is equivalent in terms of meaning and grammatically correct.

Umbindi oqhutyelwa phambili weyunithi wesitsalo senqanawa enceda inqanawa engakwaziyo ukungena ezibukweni awufuni kungena nakweliphi na izibuko lenqanawa

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
The nuclear-propelled propulsion unit of the lighter tow does not need to enter any port.