Always use air or a clean, lint-free, non-abrasive cloth to clean the laser aperturearea.
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。
2
Objective: to get anatomical parameters of pyriform aperturearea 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。
3
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.