that is to say

副词 adv.
中文释义

英文释义

副词 adv.
  1. In other words. Used to introduce a clarification, simplification, or explanation conjunctive,not-comparable
    — One of the best things about works of music is that they are repeatable, that is to say that one can listen to the same work over and over without becoming tired of it.

词源

Calque of French c'est-à-dire.
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