fall back基本解释
后退； 退却
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verb
1. go back to bad behavior
e.g. Those who recidivate are often minor criminals
Synonym: relapselapserecidivateregressretrogress
2. retreat
Synonym: losedrop offfall behindrecede
3. move back and away from
e.g. The enemy fell back
4. hang (back) or fall (behind) in movement, progress, development, etc.
Synonym: lagdawdlefall behind
5. fall backwards and down
6. have recourse to
e.g. The government resorted to rationing meat
Synonym: resortrecur
1. 后退,退却：fall back on 求助于,转而依靠 | fall back 后退,退却 | fall behind 落在...后面,跟不上
2. 回落：回铃音 Ring Back Tone | 回落 Fall Back | 回声抵消法 Echo Canceling Method ECM
3. 后退：fall short of 不足,达不到 | fall back 后退 | fall back on求助于
4. fall back的解释
4. 撤退,后退：sedan n. 色当(法国城市) | fall back 撤退,后退 | cut off 切断;割断;截断
