| 短语 | do duty as sth | 
| 释义 | do duty as sth to be used as something用以充当(代替)某物;SYNserve as sth•The living room also does duty as a home office.起居室也用作家庭办公室。⇒DOUBLE DUTY,HEAVY-DUTY⇒jury duty at JURY SERVICE⇒on active duty at ACTIVE SERVICE | 
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