postal ballot

noun

1. 邮寄式投票
   a system of voting on a particular issue in which everyone sends their vote by post

1. Unions would elect their leadership by secret postal ballot.
   工会将通过秘密邮寄选票的方式选举领导人。
2. Person at the election can take part in a postal ballot by sending in a postal vote.
   选举时无法亲自投票的人可以通过邮寄选票参加邮政选举。