alții

In a sentence

• Unii oameni cred că acest lucru este important, dar alții nu sunt de acord.

  Some people think this is important, but others do not agree.

  "Alții" is used here to refer to other people distinct from the previously mentioned group ('Unii oameni').

• Am terminat sarcina mea, dar alții încă mai lucrează.

  I finished my task, but others are still working.

  "Alții" is used to denote a group of people different from the speaker, specifically those who have not finished their tasks.

• În timp ce unii s-au bucurat de petrecere, alții au ales să plece devreme.

  While some enjoyed the party, others chose to leave early.

  "Alții" addresses a group contrasted with the first ('some'), implying a different group with an alternative action or opinion.