safety catch
安全制动装置
安全挡块
安全掣子
安全挡
断绳保险器防坠器
例句与用法：
The new law about safety belts in cars will be difficult to enforce.
规定系汽车安全带的新法规将难以实施。
Thanks to I had tied then the safety belt.
幸亏我当时系上了安全带。
She refused to sit in the car till her husband promised to wear his safety belt.
她拒绝上车，除非她丈夫答应系好安全带。
词形变化：
名词复数: safeties |
ph.
(枪、炮等的)保险机, 保险栓