Foolproofness
安全装置
🗣️ 情景例句
A journey of a thousand miles begins with a single step.
千里之行，始于足下。
Pervert!
色狼！
Fortunately, a pilot saw the signal and sent a message by radio to the nearest town.
幸运得很，一位飞行员看到这个信号，用无线电给最近的城镇发了报。