| 单词 | observation hole |
| 释义 | > as lemmasobservation hole observation hole n. ΚΠ 1876 H. T. Williams Pacific Tourist 228 The vigilant eye will be rewarded by a sight of it [sc. Donner Lake] through the observation holes in the snow sheds. 1991 Salt Water Sportsman Feb. 25/3 Only the door or hatchway, and possibly an observation hole in the top of the canopy, is furlable and the entire raft remains enclosed. < as lemmas |
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