相关单词近义词 safety valve 安全阀, valve 瓣膜, safety device 安全装置, safety precaution 安全措施, overflow 泛滥, foolproof 不会错的, guaranteed 保证的, dependable 可靠的, reliable 可靠的临近词fail, Failli相似词faggotry, fah, Fahrenheit, fail, failed, failed state, failing, failure, 返回 fail-safe