During her first week of record-keeping, she realized that the two or three doughnut holes she thought she ate were actually eight or nine;
在她开始记录的第一个星期里，她才了解到以为自己只吃了两、三个甜甜圈，实际上是吃了八、九个；
They stacked rocks with center holes (tube or doughnut shaped) from the surface to the deep stone layer as a guide for their drills (similar to today's guide tubes).
管状或中空管状的中心孔从地表到深石岩石层放满石头，以作为铁转的探头，作用类似今天的导管。
They stacked rocks with center holes (tube or doughnut shaped) from the surface to the deep stone layer as a guide for their drills (similar to today's guide tubes).
管状或中空管状的中心孔从地表到深石岩石层放满石头，以作为铁转的探头，作用类似今天的导管。
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