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

In some merchant ships they enclose the ballast tanks.
Kwezinye iinqanawe zeqhwebo zijekeleze amatanki enzima enza inqanawe izinje.

Stream a fog-buoy or target to the prescribed distance as an aid to the ship astern to keep station.
Nazike amandla akhanyayo nokuzihambela kwenqanawa.

A model of a system in which there is change, such as the occurrence of events over time or the movement of objects through space; for example, a model of a bridge that is subjected to a moving load to determine characteristics of the bridge under changing stress. [DIS; IEEE]

Yimodeli yenkqubo apho kukho khona utshintsho, olufana nokwenzeka kweziganeko kwixesha elithile okanye ukushukuma kwento esithubeni, umzekelo, imodeli yebhulorho ethwele umthwalo oyishukumisayo nto leyo ebonisa ukuba iphantsi koxinzelelo olukhulu. [DIS; IEEE]