retraction

中文： 撤回、缩回

1. An act or instance of retracting. (countable, uncountable)
2. A statement printed or broadcast in a public forum which effects the withdrawal of an earlier assertion, and which concedes that the earlier assertion was in error. (countable, uncountable)
3. A continuous function from a topological space onto a subspace which is the identity on that subspace. (countable, uncountable)

复数 retractions