ad·it /ˈædət/
入口,橫坑
ad·it n.
1. An entrance or passage. Specifically: The nearly horizontal opening by which a mine is entered, or by which water and ores are carried away; -- called also drift and tunnel.
2. Admission; approach; access. [R.]
Yourself and yours shall have
Free adit. --Tennyson.
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adit
n : a nearly horizontal passage from the surface into a mine