external acoustic foramen

例句：

1. 1. The engineer designed the external acoustic foramen to improve sound transmission efficiency.
   工程师设计了外部声学孔，以提高声音传输效率。
2. 2.During the construction of a new building, engineers carefully planned the placement of the external acoustic foramen.
   在新建建筑的建设过程中，工程师们仔细规划了外部声学孔的布局。
3. 3. The external acoustic foramen is an important component in the design of soundproofing materials.
   外部声学孔是隔音材料设计中的一个重要组成部分。