thereinto

副词 adv.
中文释义
英 /ðɛəɹɪnˈtuː/|/ðɛəˈɹɪntuː/   

英文释义

副词 adv.
  1. Into that place, state etc. archaic,not-comparable
    — Her bedroom seemed not mean nor lonely to her, since the little square of glass, nailed above the wash-stand, was ever there to reflect her face. Thereinto, indeed, she was ever peering. She would droop her head from side to side, she would bend it forward and see herself from beneath her eyelashes, then tilt it back and watch herself over her supercilious chin.

词源

From there + into.
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