rat
单词辨析：
主要指不忠于誓约或辜负信任；也可以指有意泄露秘密或出于无意暴露隐蔽的事物。
He betrayed his country.
他背叛了祖国。
She betrayed the secrets of her company.
她泄露了公司的秘密。
A visible antler behind the tree betrayed the presence of the deer.
树后面露出的角暴露了鹿的藏身之地。
尤指对配偶或性伴侣不忠。
His wife has no idea that he has been cheating on her all along.
他的妻子不知道他一直对她不忠。
He claims that almost half of the women there cheat on their partners.
他声称那里的妇女几乎有一半对自己的伴侣不忠。
主要指向掌权者告发某人，也指违背所作的承诺，常后接介词 on。
They tried to find out who had ratted on them.
他们试图找出是谁出卖了他们。
They accused the local government of ratting on its promises.
他们指责当地政府没有履行承诺。
相关例句：
Objective To study the effect of acrylamide on proliferation and differentiation of rat kidney epithelial cells.
目的研究丙烯酰胺对新生大鼠肾上皮细胞增殖分化的影响。
A rat can gnaw a hole through wood.
老鼠能啃穿木头。
I got angry with this rat.
我生了这只老鼠的气。
We therefore investigated the cellular and molecular mechanisms of a synthetic rCGRP on rat isolated atria and arteries.
因此，我们研究了合成的大鼠CGRP对大鼠离体心房和离体动脉的细胞和分子作用机制。
The two brothers stood over the dead rat and spoke in tones of awed admiration.
弟兄俩站在死鼠跟前，用又是吃惊又是赞叹的口气谈论着。
Though Lloyd George's behaviour seemed curious, Haig still did not smell a rat.
尽管劳埃德·乔治的行为古怪，黑格仍然没有任何怀疑。