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Translation

• Context: a man from the past gets reincarnated in the modern world, gets bewildered by a mirror.
• kagami.... kono {{{mizu no} you ni} suki-totta} mono ga?
  鏡・・・・この水のように透きとおった物が？
  Mirror.... this thing [that] {is clear {like {water}}}? (literally.)
  • A mirror? This thing is a mirror?
  • Here, the character is comparing the properties of the mirror to the properties of the water, except the property is a verb, suki-tooru 透き通る, "to be transparent," "to be clear," in the sense of letting you see through it (hence why tooru 通る, "to go through," is part of the compound verb).
  • Considering the sentence, I guess the mirrors he knows about, from thousands of years ago, probably looked different, and weren't as clear as water the way the modern mirror is.