落后的英文怎么缩写

　　He walked away without a backward glance.

　　他头也不回地扬长而去。

　　She strode past him without a backward glance.

　　她大步从他身边走过，都没有回头瞧他一眼。

　　We need to accelerate the pace of change in our backward country.

　　我们应当为落后的祖国加快变革的脚步。

　　The car passed over the body twice, once backward and then forward.

　　那辆车把那人来回轧了两次，先是倒着轧的`，再是往前开着轧的。

　　He took two steps backward

　　他后退了两步。