sulcus of inferior petrosal sinus

例句：

1. 1. Thecarpenter made a sulcus in the wood to hold the screws.
   木匠在木头上做了一个凹槽来固定螺丝。
2. 2. The book had asulcus on the cover that heldthe bookmark.
   这本书封面有一个凹槽，用来夹住书签。
3. 3. Thescientist used a sulcus to collect samples fromthe soil.
   科学家用一个凹槽从土壤中收集样本。