preascertain

词形变化

preascertained preascertaining preascertains 三单 preascertains preascertaining 现在分词 preascertained 过去式 preascertained 过去分词

释义与例句

v.
  1. 1.

    To ascertain in advance.

    及物

词源

From pre- + ascertain.

来源：wiktionary