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| polynia (= полынья [space of open water in the middle of ice]); vent; ice clearing (= полынья [space of open water in the middle of ice]); thawing hole in ice (= полынья [space of open water in the middle of ice]); spiracle; spiraculum | |||
| ice clearing; thawing hole in ice (space of open water in the middle of ice) | |||
| staple | |||
| air hole | |||
| breather | |||