求翻译：1. Hallway floor in basement leveling: we have noticed before and had tried to level it up couple of times during floor installation. However, the result was not very satifactory. I have asked installer to come again to refix this portion, however, according to him, the result is not guaranteed due to the undulations of the concrete slab are all directional and as such it would be very technically challenging to level it up. Therefore, in the addendum, I said "level up as much as technically feasible";是什么意思？

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