Checks should be made for signs of wear and tear, particularly at the site of screws and height adjustment mechanisms.
应作出检查的磨损，特别是在螺丝和高度调整机制的网站，标牌。
The use of saline water irrigation tear drainage system, or exploration of the duct to detect tear drainage pipes may be the site of obstruction.
使用生理食盐水灌洗泪液排流系统，或以泪管探条来探测泪液排流管道可能阻塞的部位。
The use of saline water irrigation tear drainage system, or exploration of the duct to detect tear drainage pipes may be the site of obstruction.
使用生理食盐水灌洗泪液排流系统，或以泪管探条来探测泪液排流管道可能阻塞的部位。
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