为了避免意外事故，必须经常保持警惕。
Constant vigilance is necessary in order to avoid accidents.
应有严格的技术措施和操作程序，以确保维修工作安全、可靠和快捷，避免意外事故发生。
There should be strict operating procedures and technical measures to ensure the maintenance of safe, reliable and fast to avoid the accident occurred.
由于声音对视觉受损人来说是个很重要的感官，所以耳机要选用开放式的，以避免听不到周围的声音而造成意外事故。
With sound being an even more important sense for the visually impaired, these would be open headphones to allow ambient noise to be heard.
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