It should then be re applied at least every two hours, as the protective filters can break down over time.
至少每隔两小时要补一次防晒，因为保护物质会慢慢分解。
The Anglo-French company rushed to fix the problem it said caused several of its trains to break down: powdery snow that seeped through protective filters and triggered a major engine malfunction.
这家英法合资公司一直在抓紧时间解决问题。公司说，导致几辆列车瘫痪的原因是：粉状降雪渗透到保护过滤器中，引发引擎出现了严重故障。
Protective countermeasures are under development, including lens shutters and filters that block certain laser frequencies.
防御性对策正在开发，包括透镜光闸及滤波器，能阻止某个频谱的激光。
Protective impedance and radio interference filters are disconnected before carrying out the tests.
打耐压前是要断开保护阻抗的。
Protective impedance and radio interference filters are disconnected before carrying out the tests.
打耐压前是要断开保护阻抗的。
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