Definition
The practice of using multiple precautions or measures to ensure success or safety, often more than what is strictly necessary.
双重保险，力求完备
To ensure data security, we not only backed up the hard drive but also stored all files in the cloud, which is a case of belt and braces.
为了确保数据安全，我们不仅备份了硬盘，还将所有文件存储在云端，这是一个双重保险的做法。
He sent an email and a text message; it was belt and braces to make sure I received the notification.
他发了一封电子邮件和一条短信；这是双重保险，确保我收到通知。
We had two editors proofread the report before its release; it was a belt and braces approach.
我们在报告发布前请了两位编辑进行校对；这是一种双重保险的方法。