tunnelling.（円形断面のトンネルを掘削するため）とは - 英語 - 多言語

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tunnelling.

(engineering) A large machine used to excavate tunnels with a circular cross section.

The tunnel boring machine advanced slowly through the mountain, removing rock and installing concrete segments as it progressed.

A device used to form an image of the surface of a conductor or semiconductor with atomic resolution.

The research team used a scanning tunneling microscope to map the arrangement of atoms on the silicon surface.