您要查找的是不是：
- 退步regress
- 落后于trail
- 技术落后lag in technology
- 落后地区backward area
- 退步的retrogressive
- 经济落后backward in economy
- 更新基因的退步夸大了。The degeneration of regenerative gene is exaggerated.
- 落后国家backward country
- 留个退步leave some room for manoeuvre; leave some leeway
- 落后就要挨打vulnerable to attack if lagging behind
- 退步跨虎t`ui pu k`ua hu [stepping back to ride the tiger]
- 经济落后的国家backward country
- 这就是所谓日本战争的退步性。This is what we mean by the retrogressive nature of Japan's war.
- 那辆车跑了一半赛程就落后了。The car dropped back halfway through the race.
- 社会性退步social decrement
- 落后者laggard
- 退步法backward step
- 他原本能按预定进度做完这件事的，但不知怎地却落后了。He could have finished it on schedule, but somehow he fell behind.
- 蛇退步three-leaved pronephrium herb
- 贫穷落后poor and backward; impoverished and backward
