May someone elp me pls

Many plains indians who were forced onto reservations had trouble adapting because they were not used to living within borders. used to hunting for their food. not used to living in communities. used to working in factories.

Read the excerpt from "mending wall." we keep the wall between us as we go. to each the boulders that have fallen to each. and some are loaves and some so nearly balls we have to use a spell to make them balance: "stay where you are until our backs are turned! " we wear our fingers rough with handling them. oh, just another kind of out-door game, one on a side. it comes to little more: there where it is we do not need the wall: he is all pine and i am apple orchard. what does the line “and some are loaves and some so nearly balls” refer to?

Can someone translate the swahili word 'cheo' for me ? i do not understand.