告密，告发某人：指向警方透露他所知道的一切。
撤销(rat on), 此释义来源于网络辞典。
摘要：大鼠骨粘连蛋白(Rat ON)ELISA Kit说明书北京ELISA试剂盒代测，氨基酸，..
怀疑有问题；发现不对头；有所警觉（rat on） mouse (复数：mice) 是指 小鼠，而 rat (复数：rats) 是指的 大鼠 ，是两种不同的物种。英文里区别非常清楚。
They were accused of encouraging children to rat on their parents.
他们被指控怂恿孩子们告发他们的父母。
A rubber rat on top of an overflowing garbage can is a nice touch.
放一只橡胶制成的老鼠在一个堆满了垃圾的罐头上是一个很棒的手法。
A rubber rat on top of an overflowing garbage can is a nice touch. No one will get close enough to see if it's fake.
放一只橡胶制成的老鼠在一个堆满了垃圾的罐头上是一个很棒的手法。没人会试图接近来确认它是否是假的。
If you rat someone out in jail, someone puts a contract out on you.
如果你坦白了,你是在自找麻烦
博弈论课程节选 : 耶鲁公开课
Why not just put our own orgasmitron hat on with a little-- not rat lever, but now human lever-- with the electrodes stimulating our own brains so that we get this intense burst of pleasure?
我们为何不带上电子高潮帽-,把老鼠杠杆变成人类杠杆-,用电极刺激我们的大脑,获得强烈的快感？
死亡课程节选 : 耶鲁公开课
If you put the electrode in just the right place, then when the electrode gets turned on, it stimulates the pleasure center in the rat's brain and it gets a little burst of pleasure, a pretty intense burst of pleasure.
只要把电极放对地方，然后启动电极，刺激老鼠大脑的快乐中枢,老鼠感受到一股快感，一股很强烈的快感。
死亡课程节选 : 耶鲁公开课
The government set up hot lines for reporting them, and early in the campaign handed out "Rat on a Rat" bumper stickers.
WSJ: In Alberta, Citizens Smell a Rat After Long-Banned Rodents Appear
Stockman waited all of three months to rat on his colleagues.
The team set the cyber-rat loose on two different groups of the furry subjects.
ENGADGET: Alt-week 2.16.13: robo-rats, a young black hole and a computer that cannot crash