Many presidents seem to have taken the advice of President Harry Truman who said: "If you want a friend in Washington,get a dog."

VOA: special.2009.02.23

You're--and to put it in a crude way, you're teaching the dog that the bell goes with the food.

简单地说，你在让狗知道,铃声和食物是一起出现的。

耶鲁公开课 - 心理学导论课程节选

When Pavlov put food powder in the dog's mouth and saliva was generated, that's an unconditioned stimulus giving rise to an unconditioned response.

巴甫洛夫给狗喂食,狗会分泌唾液，这就是无条件刺激引起了无条件反应。

耶鲁公开课 - 心理学导论课程节选

This how the system works in Boston: The jobs available include house cleaning,dog walking and home repair.

VOA: special.2009.02.02

What he would do is he'd put food powder in the dog's mouth to generate saliva.

他的做法是,给狗喂食，让狗分泌唾液。

耶鲁公开课 - 心理学导论课程节选

The two patches of waste are connected together in the shape of a dog bone a really big bone about nine thousand kilometers long.

VOA: special.2009.09.22

It shows a dog jumping up high in the living room of an average American home.

VOA: special.2009.11.20

Then when Smiley's dog come to make a grab the other dog's back legs, he saw in a minute how there was a problem.

VOA: special.2009.08.29

The dog's legs had been cut off in a machine.

VOA: special.2009.08.29

The AKC recognizes dog breeds in the United States.

VOA: special.2009.02.23

much like a dog on Earth. I walked close to the creature and began speaking in much the same way I would speak to a dog or other animal on Earth.

VOA: special.2010.07.17

The dog heard danger in the man's voice.

VOA: special.2010.05.01

He performed in the Broadway play "Top Dog,Underdog."

VOA: special.2009.07.24

Dr.Joan Esnyara, president and founder of the Psychiatric Service Dog Society in Arlington,Virginia.

VOA: standard.2010.05.18