| 单词 | redan | 
| 释义 | redannoun  re·dan   rə̇ˈdan    plural -s     : a fortification having two parapets forming a salient angle, an unfortified entrance usually protected by its location (as on the bank of a stream, at the head of a bridge, or in advance of a strong line), and often a connection (as by curtains) with other such fortifications as a simple form of fieldwork   | 
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