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1.The surgeon made a sigmoid sulcus in the patient's neck to relieve pressure on his spinal cord.
外科医生在病人的颈部做了一个楔形槽，以减轻对脊髓的压力。
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2. The carpenter used a chisel to make a sigmoid sulcus in the wood for a shelf.
木匠用凿子在木头上做了一个楔形槽，用来做书架。
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3. The engineer designed the machine with a sigmoid sulcus that would allow it to fit through tight spaces.
工程师设计的机器有一个楔形槽，可以让它穿过狭窄的空间。