探索排水管、隧道或下水道的活动
drainings — plural of draining
探索排水管、隧道或下水道的活动；排空的过程；排水的过程
探索排水管、隧道或下水道的活动
The practice of exploring drains, tunnels, or sewers.
排空的过程；排水的过程
The process by which something is drained or emptied.
发长 /eɪ/ 音 (如 rain, wait)
Same pattern, same sound
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