a passageway through or under something, usually underground (especially one for trains or cars)
a hole made by an animal, usually for shelter
例句
用作名词 (n.)
The sensors rely on quantum tunnelling, in which electrons take journeys that would not be allowed by the laws of classical physics, as long as the distances involved are tiny. 这些传感器根据量子隧道效应的原理工作，即只要间隔的距离非常微小，电子就能穿过经典物理学认为不能通过的势垒。
美
['tʌnəlɪŋ]
