open back frame

例句：

1. 1. The car's openback frame is designed to be easily accessiblefor passengers.
   这辆车的后门框架设计得便于乘客使用。
2. 2. The newdesign of the back doorframe has made it more secureand aesthetically pleasing.
   新设计的后门框架使安全性更高且外观更吸引人。
3. 3.The rear door frame was reinforced withsteel to improve its durability.
   后门框架被加固以增强其耐用性。