What is the meaning of create a preferential how this voting system works

It is a system of voting that allows a citizen to individually number and rank all candidates for both houses of parliament according to their preferences. Which means a citizen's vote can still be counted, even if their first choice of candidate is eliminated due to a lack of votes.

one of the central themes of edward abbey's work has been his staunch opposition to the glen canyon dam on the colorado river that created lake powell, destroying stunning scenery and wildlife habitat, endangering many rare species of fish and animals, and also irreparably destroying many important archaeological sites which provided information about the early inhabitants of the united states.