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foci

/foh-sahy, -kahy/US // ˈfoʊ saɪ, -kaɪ //

焦点,重点,焦点问题,重点领域

Related Words

Definitions

n.名词 noun
  1. 1
    • : a plural of focus.

Synonyms & Antonyms

Examples

  • In an orbit made elliptical by the planetary attraction the sun necessarily occupies one of the foci of the ellipse.

  • That an ellipse may be given any required proportion of width to length by locating the foci at the requisite distance apart.

  • That the proportion of length to width in an ellipse is determined by the distance apart of the foci.

  • The curve thus traced will be an ellipse having the pins at the two points which are called its foci.

  • These are at points on the principal axis that are twice as far from O, the center of the lens, as are the principal foci.