aperture area meaning in English

开孔面积
开口面积

Slide projectors and slides ; overhead projectors ; aperture area , location pins , projection screens , evaluation
幻灯放映机和幻灯片.字幕片放映机.第7部分:孔径区
Figure 5 . transfer efficiency of a solder paste related to aperture area ratio and its effect on reflowed bump co - planarity
图5 ，锡高转移的效率与孔面积比率及它对回流峰共面度的影响。