Always use air or a clean, lint-free, non-abrasive cloth to clean the laser aperture area.
请永远使用吹气或是干净，不会起毛的软布来清洁这个区域。
Objective: to get anatomical parameters of pyriform aperture area and to investigate its clinical significance.
目的：获得有关梨状孔的各项解剖学数据并探讨其临床意义。
The f-stop, otherwise known as the aperture, determines your depth of field (the area in focus) and how much light can pass through the lens to reach the sensor.
f制光圈(或称光圈)决定相机的景深(对焦区域)以及有多少光能通过镜头到达传感器。
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