An user Spanish
says…

Es
Auxiliary
  una
Determiner
  curva
Noun
  que
Pronoun
  describe
Verb
  una
Determiner
  oscilación
Noun
  repetitiva
Adjective
  y
Coordinating conjunction
  suave
Adjective
.

It is a curve that describes a repetitive and smooth oscillation.
Words and sentences
New
es

New
una

New
curva

New
que

New
describe

  1. inflection of describir:
  2. inflection of describir:

New
oscilación

oscillation

New
repetitiva

feminine singular of repetitivo

New
suave

  1. smooth, soft, fluffy
  2. soft, gentle, light, mild (e.g. mild flavor, a mild winter)
  3. suave (charming, confident and elegant)
  4. cool, acceptable, easy

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