prolungabile significa in inglese

extendable▼(capable of being extended)
adjective
[UK: ɪk.ˈsten.dəb.l̩] [US: ˌek.ˈsten.dəb.l̩]

extensible▼(capable of being extended)
adjective
[UK: ɪks.ˈten.səbl] [US: ɪk.ˈsten.sə.bəl]