sap·per /ˈsæpɚ/
挖地道的兵,工兵
Sap·per n. One who saps; specifically Mil., one who is employed in working at saps, building and repairing fortifications, and the like.
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sapper
n 1: a military engineer who lays or detects and disarms mines
2: a military engineer who does sapping (digging trenches or
undermining fortifications)