precover

词形变化

precovers 复数 precovers precovered precovering precovers 三单 precovering 现在分词 precovered 过去式 precovered 过去分词

释义与例句

n.
  1. 1.

    A generalization of a cover in which the kernel may contain a non-zero pure subgroup.

    数学
  2. 2.

    Something that occurs in preparation for a covering.

v.
  1. 1.

    To find an older image of an object in archived images after it has been discovered.

    天文

词源

From pre- + cover.

来源：wiktionary