concentrate, focus

Richard S. (United States of America)
4 words 0 learners

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Full list of words from this list:

words only definitions & notes
  1. concentrate
    make denser, stronger, or purer
  2. focus
    the concentration of attention or energy on something
  3. sharpen
    make sharp or sharper
  4. focal point
    a point of convergence of light (or other radiation) or a point from which it diverges
Created on 二月 4, 2010 (updated 二月 4, 2010)

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