1.后退
2.下降;减少
1.to move so that you are behind someone or something
2.to become smaller or lower in amount, level, value etc
1.Plan to have at least one year's living expenses to fall back on or provided for by a second household income.
计划出至少一年的生活开支，或者要有第二份家庭收入来支付。
2.Certainly this makes it less likely that the U. S. could fall back into a recession soon, at least according to Goldman Sachs (GS).
这一变化肯定会使美国迅速陷入经济衰退的可能性降低，至少高盛投资公司（GoldmanSachs）是这么认为。
3.Know at least two or three languages, so if one dies off, you have another one to fall back on while you train for a new technology.
至少了解两到三种语言，所以，如果某种语言过时了，你在学习新技术的时候还可以依靠另一种语言。
4.Just did not expect, the food chain, eventually fall back to a human top of his head.
只是没想到，这条食物链最终回落到了人类自己的头上。
5.He had to have a fall-back stratagem; a second method of trying to ensure that the evidence of the Allied deception reached the Abwehr.
为确保把盟军施用疑兵计的证据送给“阿勃韦尔”，他还必须想一条退路，做好第二手准备。
6.Even if Samsung's smart-phone future is up in the air, the company can fall back on a hidden weapon: its semiconductor pision.
三星智能手机的命运悬而未决，公司还有一个秘密武器可以依赖：半导体。
7.An order came for him to fall back and support our right. Instead, he moved forward and went over the hill to the left.
上级下达了命令，让他后退来支持其他部队的右翼，可是，他却往前进发，爬上了左面的山头。
8.Sometimes, two people have to fall apart to realize how much they need to fall back together.
有时候，两个人要分开以后才会意识到，他们多想在一起。
9.Relatively cheap and easy to do, though it would require non-stop effort as the chemicals gradually fall back to Earth.
成本较低而且简便易行，但由于化学物质会逐渐落到地面，使用这种方法需要不断地向大气中喷洒硫化物。
10.When the big bills for his wife's hospital care came, he was glad he had money in the bank to fall back on.
当他收到妻子的一大笔住院费的帐单时，他因为银行里有一笔钱而感到欣慰。