1. 名詞
   canceler複數: 取消者
   相互抵銷者
   消除器
   補償設備
   

   同義字詞
   balance,corrective,counter,counteraction,counterbalance,counterforce,counterpoise,counterweight,equipoise,neutralizer,offset
   

例句

1. He also brought with him several hand cancelers that he prepared for use on Second Cancellation mail.
2. "Canceling Mechanician" Charles F. Anderson departed Washington, D.C. along with 62,000 pieces of Second Cancellation mail and new cancelers on November 7, 1934.
3. In response to this, AT&T Bell Labs developed echo canceler theory in the early 1960s, which then resulted in laboratory echo cancelers in the late 1960s and commercial echo cancelers in the 1980s.