您要查找的是不是：
- 退步regress
- 落後於trail
- 技術落後lag in technology
- 落後地區backward area
- 退步的retrogressive
- 經濟落後backward in economy
- 更新基因的退步誇大了。The degeneration of regenerative gene is exaggerated.
- 落後國家backward country
- 留個退步leave some room for manoeuvre; leave some leeway
- 落後就要挨打vulnerable to attack if lagging behind
- 退步跨虎t`ui pu k`ua hu [stepping back to ride the tiger]
- 經濟落後的國家backward country
- 這就是所謂日本戰爭的退步性。This is what we mean by the retrogressive nature of Japan's war.
- 那輛車跑了一半賽程就落後了。The car dropped back halfway through the race.
- 社會性退步social decrement
- 落後者laggard
- 退步法backward step
- 他原本能按預定進度做完這件事的，但不知怎地卻落後了。He could have finished it on schedule, but somehow he fell behind.
- 蛇退步three-leaved pronephrium herb
- 貧窮落後poor and backward; impoverished and backward
