The S-train network is an urban rail network which serves Copenhagen city centre, surrounding boroughs as well as several suburbs in the Copenhagen area, in Denmark. It connects the city centre, the inner and the outer boroughs and suburbs with each other. The average distance between stations is 2.0 km, shorter in the city core and inner boroughs, longer at the end of lines that serves suburbs. Of the 85 stations, 32 are located within the central ticket fare zones 1 and 2.

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In chemistry, a molecule experiences strain when its chemical structure undergoes some stress which raises its internal energy in comparison to a strain-free reference compound. The internal energy of a molecule consists of all the energy stored within it. A strained molecule has an additional amount of internal energy which an unstrained molecule does not. This extra internal energy, or strain energy, can be likened to a compressed spring. Much like a compressed spring must be held in place to prevent release of its potential energy, a molecule can be held in an energetically unfavorable conformation by the bonds within that molecule. Without the bonds holding ...

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  1. Treasure.
  2. The blood-vessel in the yolk of an egg.
  3. Race; lineage, pedigree.
  4. Hereditary character, quality, or disposition.
    There is a strain of madness in her family.
  5. A tendency or disposition.
  6. Any sustained note or movement; a song; a distinct portion of an ode or other poem; also, the pervading note, or burden, of a song, poem, oration, book, etc.; theme; motive; manner; style
  7. A particular breed or race of animal, microbe etc.
    They say this year's flu virus is a particularly virulent strain.
  8. A portion of music divided off by a double bar; a complete musical period or sentence; a movement, or any rounded subdivision of a movement.
  9. A kind or sort (of person etc.).

Noun (etymology 2)

  1. The act of straining, or the state of being strained.
  2. A violent effort; an excessive and hurtful exertion or tension, as of the muscles.
    ''He lifted the weight with a strain
    ''the strain upon the sailboat's rigging
  3. An injury resulting from violent effort; a sprain.
  4. A dimensionless measure of object deformation either referring to engineering strain or true strain.
  5. The track of a deer.


  1. To hold tightly, to clasp.
  2. To apply a force or forces to by stretching out.
    to strain a rope; to strain the shrouds of a ship
    Relations between the United States and Guatemala traditionally have been close, although at times strained by human rights and civil/military issues.
  3. To damage by drawing, stretching, or the exertion of force.
    The gale strained the timbers of the ship.
  4. To act upon, in any way, so as to cause change of form or volume, as when bending a beam.
  5. To exert or struggle (to do something), especially to stretch (one's senses, faculties etc.) beyond what is normal or comfortable.
    Sitting in back, I strained to hear the speaker.
  6. To stretch beyond its proper limit; to do violence to, in terms of intent or meaning.
    to strain the law in order to convict an accused person
  7. To tighten (the strings of a musical instrument); to uplift (one’s voice).
  8. To separate solid from liquid by passing through a strainer or colander
  9. To percolate; to be filtered.
    water straining through a sandy soil
  10. To make uneasy or unnatural; to produce with apparent effort; to force; to constrain.
  11. To urge with importunity; to press.
    to strain a petition or invitation

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