Depuis

Adposition

  sa

Determiner

  découverte

Noun

,  de

Determiner

  nombreuses

Adjective

  améliorations

Noun

  et

Coordinating conjunction

  techniques

Noun

  alternatives

Adjective

  ont

Auxiliary

  été

🏖️

Auxiliary

  proposées

Verb

.

Since its discovery, many improvements and alternative techniques have been proposed.

Since its discovery, many improvements and alternative techniques have been proposed.