代替词是aperture，例如：

1、Through the aperture he could see daylight.透过缝隙，他能看见日光。

2、Experimental Investigation into Frequency Characteristics of FSS Basic Aperture Cell.FSS基本缝隙单元频率特性的实验研究。

3、Effect of wall aperture on sound propagation within a tube.管壁上缝隙对管内声传播的影响。