In that experiment, Ledoux conditioned rats to fear a bell by ringing it in time with anelectric shock until the rats froze ...

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yǐ qián sì jí yàn huò kàn ， zhěng bù jù fǎng fú zài shuō jiāo lǜ ， sì hū zài liáo xiàn shí ， hǎo xiàng shì tú xún zhǎo zhōng ...

Percy Bysshe Shelley in his poems called on the people to overthrow the rule of tyranny and injustice and prophesied a happy ...

This paper reviews the 30 years' monitoring and prediction works in earthquake sites in China., 回顾了我国30多年来的地震现场震情监视预报工作。

99、 méi yǒu wéi nǐ shāng chūn bēi qiū ， suǒ yǐ bù pèi yǒu hàn shì 。

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This video should put you in the best situation for learning ...