Question

air hole
air hole  
n.（名词）
1.A hole or opening through which gas or air may pass.
    气孔：天然气或空气可以通过的孔或开口
2.An opening in the frozen surface of a body of water.
    冰窟窿：水体的冰冻面上形成的开口
3.See  air pocket
    参见  air pocket