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1·The government is accused of ratting on its promises to the unemployed.

政府被指责对失业者背信弃义。《牛津词典》

2·Have you ever heard dogs going ratting?

你听说过狗拿耗子么？

3·Have you ever heard about dogs going ratting?

你听说过狗拿耗子吗？

4·The trumpet answers it with loud ratting sound.

小号响亮地回答哒哒哒哒哒哒哒；

5·No more tramping hoofs, no more ratting wheels!

哒哒的马蹄声不再，辚辚的车轮声不再！

6·Karl: Thanks for ratting out my kid on his first day.

谢谢你第一天就找我孩子麻烦。

(1)smell a rat感到不妙；感到有可疑之处

(1)rat racen. [俚]激烈竞争（商业上）；无意义的竞争；[电]环形导波管

(1)like a drowned rat浑身湿透（象落汤鸡）

(1)rat poison杀鼠剂，老鼠药；鼠毒

(1)pack rat不可靠的人，有敛癖的人

(1)white rat白鼠