have down to a science

短语

词形变化

had down to a science has down to a science 三单 has down to a science having down to a science having down to a science 现在分词 had down to a science 过去式 had down to a science 过去分词

释义与例句

v.
  1. 1.

    To know something backwards, to know something inside and out.

    及物