But their surfaces bear witness to homely labor: Topping the tallest stone, once part of a trilithon, is a tenon—half of a mortise-and-tenon joint borrowed from woodworking.

但巨表面见证了平凡：曾是三塔组成分最高那块巨有个凸榫——是从木材加工借鉴而来半个榫臼接头。