retract

大学 FREQ #19582 ★☆☆☆☆

v. 缩回, 收回, 取消, 撤消

发音

CA /ɹɪˈtɹækt/
其它
AU /ɹɪˈtɹækt/
UK /ɹɪˈtɹækt/
US /ɹɪˈtɹækt/
US /ɹiˈtɹækt/
US /ɹəˈtɹækt/

词形变化

retracts 复数 retracts 三单 retracting 现在分词 retracted 过去式 retracted 过去分词 retractest retractedst 过去式 retracteth 三单 retracted 复数

教材释义与例句

名词

收缩核

释义与例句

n.
  1. 1.

    An act of retracting or withdrawing (a mistake, a statement, etc.); a retraction.

    废旧
  2. 2.

    A pulling back, especially (military) of an army or military troops; a pull-back, a retreat; also, a signal for this to be done.

    废旧
  3. 3.

    A subgroup of a given group such that there is a surjective endomorphism from the ambient group to the subgroup which is constant on the subgroup; in this case the subgroup is a retract of the ambient group. In symbols: H in G is a retract of G if there exists a surjective homomorphism σ from G to H with σ|_H= operatorname id.

    废旧 数学
  4. 4.

    The target of a retraction.

    废旧 数学
  5. 5.

    Synonym of retreat (“an act of accidentally injuring a horse's foot by incorrectly nailing it during shoeing”).

    废旧
v.
  1. 1.

    To pull (something) back or back inside.

    收起

    收回

    及物

    An airplane retracts its wheels for flight.

  2. 2.

    To pull (something) back or back inside.

    To draw (an extended body part) back into the body.

    缩

    及物 生物 动物学

    A cat can retract its claws.

  3. 3.

    To avert (one's eyes or a gaze).

    罕用 及物
  4. 4.

    To pronounce (a sound, especially a vowel) farther to the back of the vocal tract.

    后移

    及物 语言学
  5. 5.

    To hold back (something); to restrain.

    废旧 及物
  6. 6.

    To draw back; to draw up; to withdraw.

    不及物

    The bus was stuck at the stop as its wheelchair ramp wouldn’t retract after use.

    Muscles retract after amputation.

  7. 1.

    To cancel or take back (something, such as an edict or a favour or grant previously bestowed); to rescind, to revoke.

    废旧 及物
  8. 2.

    To break or fail to keep (a promise, etc.); to renege.

    废旧 及物
  9. 3.

    To take back or withdraw (something that has been said or written); to disavow, to repudiate.

    废旧 及物

    I retract all the accusations I made about the senator and sincerely hope he won’t sue me.

  10. 4.

    Originally in chess and now in other games as well: to take back or undo (a move); specifically (card games) to take back or withdraw (a card which has been played).

    废旧 及物 游戏
  11. 5.

    To decline or fail to do something promised; to break one's word.

    不及物 废旧
  12. 6.

    Of something said or written (such as published academic work): to take back or withdraw.

    不及物 废旧
  13. 7.

    To change one's mind after declaring an intention to make a certain move.

    古体 不及物 废旧 游戏

词汇关系

动词

同义词 8

recant abjure draw back draw in forswear pull back resile shrink back

上位词 10

pull draw shrink attract funk renounce quail flinch disown recoil

下位词 2

introvert invaginate

近义相关 5

pull draw attract pull in draw in

相关短语

deformation retract deformation-retract

词源

Partly: * from retract (verb) (see etymology 1); and * from Late Latin retractus (“a pulling back, retreat; refuge”), from Latin retractus (“withdrawn”), the perfect passive participle of Latin retrahō (“to draw or pull back, withdraw; to bring back; to compel to turn back; to recall; to get back, recover; to hold back, restrain, withhold; to remove, take away; to bring to light again; (Late Latin) to delay”) (see etymology 1) + -tus (suffix forming action nouns from verbs). Doublet of retrait, retreat, and ritratto.

来源：wiktionary