However, operators must not rely exclusively on these safety devices: they must also become fully familiar with the safety guidelines presented below to ensure accident-free operation.
不过，使用者一定不要单单依赖这些安全装置：他们也必须完全熟悉下面所示的安全指南以确保无事故操作。
2
They had to be cut free from their car after the accident.
事故后，得破开汽车把他们救出来。
《牛津词典》
3
Or do you think it's an accident that file-sharing and free culture have roots in the free software community?