occult line

名词 n.
中文释义

英文释义

名词 n.
  1. A line drawn as a part of the construction of a geometrical figure or problem, but not to appear in the finished plan.
    — Yet in making an occult line on my chart, to indicate this rise from a depth at present beyond estimate, I by no means meant it as a mark for shoal water in which navigation is concerned.

词形变化

occult lines plural
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