1. Post office official or official of the post office. 
   邮政部官员。
2. help out by taking someone's place an temporarily assuming his responsibilities. 
   通过替代别人的位置来帮助他解决困难、临时承担他的义务。
3. We were shown around by an elderly guide. 
   一位年长的向导带我们参观了一下。
4. the cardiac cycle can be shown on an electrocardiogram. 
   心电图能够显示心博周期。
5. insure again by assuming all or a part of the liability of an insurance company already covering a risk. 
   通过承担一个已承担风险的保险公司的全部或部分的责任来再次保险。

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