The backmost square-shaped chamber of that inner shrine was the inner sanctum or the holy of holies.
神殿最后面的正方形的空间,是内圣所或者说，最神圣的地方。
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Some toothbrush shapes will suit some mouths better than others. Make sure that your toothbrush bristles comfortably reach your backmost molars, as some brushes may be too large or wide.