n.抽出；拔出；抽出物；血統(tǒng)
Her teeth are so bad that she needs five extractions. 她牙齒壞得厲害，得拔掉五顆。
She came from a family of Irish extraction but not Catholic. 她出身于一個(gè)愛(ài)爾蘭血統(tǒng)的家庭，不過(guò)并不是信天主教的。
