这项新政策背后的主要动机是为了改善公共安全。

The primary ___motivation behind the new policy was to improve public safety.

对许多员工来说，财务保障是留在一份要求很高的工作中的关键动机。

For many employees, financial security is the key ___motivation for staying in a demanding job.

为孩子们创造一个更美好的未来，是他创业的主要动机。

A desire to create a better future for his children was his main ___motivation for starting the business.