letter bomb

noun

1. 书信炸弹（藏匿在书信中，开封即爆炸）
   a small bomb that is sent to sb hidden in a letter that explodes when the envelope is opened

1. 书信（或邮包）炸弹
   A letter bomb is a small bomb which is disguised as a letter or parcel and sent to someone through the post. It is designed to explode when it is opened.

1. An Iraqi terrorist, Khay Rahnajet, didn't pay enough postage on a letter bomb.
   伊拉克的名叫凯·拉纳加的恐怖分子在寄一个装有炸弹的邮件时没有付够邮资。
2. Another letter bomb in Great Britain.
   又有一份邮件炸弹在大不列颠出现。

noun

1. a thin explosive device inside an envelope or package and detonated when opened

   Synonym:    parcel bombpackage bomb

verb

1. send an explosive to
   1. The Unabomber letter bombed a number of individuals and institutions