that is

副词 adv.
中文释义

英文释义

副词 adv.
  1. In other words; that is to say. Used to introduce a clarification or explanation conjunctive,not-comparable
    — The Brazilian population is multiethnic—that is, it has many ethnicities.

词源

Etymology tree
Old English þæt is
English that is
Inherited from Old English þæt is.
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