美 [fɔːl bæk]
后退，撤退：指从原来的位置或状态向后移动或退回。
fall back //
动词 to recede or retreat 后退; 撤退
名词 a retreat 撤退
to break off a military action with an enemy
同义词： disengagement / fallback / pullout
fall backwards and down
hang (back) or fall (behind) in movement, progress, development, etc.
同义词： lag / dawdle / fall behind
retreat
同义词： lose / drop off / fall behind / recede
go back to bad behavior
同义词： relapse / lapse / recidivate / regress / retrogress
回落-引用次数：1
By launching the ball into the injected gas, it can form the steady slug flow and prevent liquid to fall back because of the solid interface between gas and liquid phases. Thus, it can improve the instability of gas lift, and reduce the slippage between gas and liquid phases thereby, increase lifting efficiency.
球塞气举是一种新型高效的气举采油方式，采用U型双管柱(一注一采)，在地面注入气流中投入气举球，使之在举升管柱气体和液体之间形成一连串的固体界面以实现稳定理想的段塞流状态，有效地防止液体回落，从而提高气举的稳定性，减小滑脱损失，提高举升效率。
后降
备用
退步运行
...三分钟手刃斯坦福桥 朱鲁在第31分钟打进乌龙，不过随后范佩西挺身而出，他的梅开二度帮助阿森纳从斯坦福桥全身而退(Fall back)。 3分钟实现2球，在加拉自传(Autobiography)中简直(Simply)就是更衣室害群之马的范佩西，用场上表现回击了前任队长的指责。
撤退（Fall Back）并不是炸了窝一样的乱跑，而是有组织的边打边撤，有时候当你面对过于强大的对手时，只有这种方式才能成功摆脱敌人。
... fair return合理利润；合理收益 fall back回落 false accounting伪造帐目 ...
退却，后退；回落
Inflation could fall back into single figures as early as this month.
通货膨胀最早在本月就能回落到一位数。
I have a little money in the bank to fall back on.
我在银行还有一点钱，需要时可以动用。
He has her support to fall back on when the going gets tough.
当进展艰难时，他可以依赖她的支持。
An order came for him to fall back and support our right.
VOA : special.2010.03.27
Well let's see. My fall back is, I could just do linear search, walk down the list one at a time, just comparing those things. OK. So that's sort of my base. But what if I wanted, you know, how do I want to get to that sorted list? All right?
我只能做线性搜索了,一次遍历一遍列表，一个一个比较，但如果我想要,那怎样得到有序的列表呢？,现在的一个问题是，我们排序之前？
计算机科学及编程导论课程节选 : 麻省理工公开课
Well, I actually think the Russian formalists can be defended against the charge that, unbeknownst to themselves, they fall back in to form-content distinctions by insisting on this variety of dualities.
但是我认为,这些形式主义者们在不自觉中，对于形式和内容的双重性,太过偏执。
文学理论导论课程节选 : 耶鲁公开课
There should be no misunderstanding. We are not going to leave Afghanistan to fall back into the hands of terrorists and the extremists who host them.
VOA : standard.2009.12.05
"I though it was a good response from the team, we did not just fall back into our shell and just let it all go out the window,"
VOA : standard.2009.06.07
If (when) this happens, there will be no third party to fall back on.
They were over achievers and, all things being equal, will fall back to earth in 2012.
FORBES: MLB 2012: Bill James's Slick, Simple Stat Picks the Baseball Season's Winners and Losers
When under attack, Europe's leaders fall back upon 60 years of peace in Europe.