| 单词 | flap-door |
| 释义 | > as lemmasflap-door flap-door n. ΚΠ 1844 Zoologist 2 748 The flap-door of a glass hive is opened. 1881 Trans. Amer. Inst. Mining Engineers 1880–1 9 133 Flap-door, a man~hole door. < as lemmas |
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