安全地观测日食需要特制在玻璃、暗箱或望远镜上的过滤装置，因为没有这样的保护装置直视太阳会导致视觉创伤。
Viewing solar eclipses safely requires special filters on glasses, cameras, and telescopes, because looking directly at the sun without such protection can cause eye damage.
直视骄阳是危险的，只能通过适合的日食镜、配有滤光片的望远镜或者针孔投影系统观看日食。
Viewing the Sun's harsh light should only be done through protective equipment - proper solar glasses and solar telescopes, or through a pinhole projection system.
结论输尿管镜直视下气压弹道碎石术治疗输尿管结石，碎石确切、安全、组织损伤小，清除彻底，并发症少，可视为输尿管中段和下段结石的首选治疗方法。
Conclusion pneumatic lithotripsy by rigid transurethral ureteroscopy is an useful, safe and efficient technique in the treatment of calculi in the mid and distal ureter.
应用推荐