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keel

/kiːl/

含义 1

the ridge on a bird's breastbone

“The bird's keel helped it fly gracefully.”
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keel 的插图：the ridge on a bird's breastbone

含义 2

The main structural beam of a ship.

“The shipbuilder inspected the keel for any damage.”
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keel 的插图：The main structural beam of a ship.