| 单词 | clack-door | 
| 释义 | > as lemmasclack-door   clack-door  n. an opening into the clack-box of a pump. Π 1867    W. W. Smyth Treat. Coal & Coal-mining 181  				If the water..rises above the clack-door before the change be made. < as lemmas  | 
	
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