戴维·艾森巴赫在哥伦比亚大学教授一门关于美国总统的热门课程，他更偏爱课上考试。

David Eisenbach, who teaches a popular class on U.S. presidents at Columbia, prefers the in-class variety.

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戴维·艾森巴赫（David Eisenbach）在哥伦比亚大学教授一门关于美国总统的热门课程，他更注重课堂的多样性。

David Eisenbach, who teaches a popular class on U.S.?presidents?at?Columbia,?prefers?the?in-class?variety.

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巴赫于1685年生于艾森纳赫的一个音乐世家，他接受了全面的早教并被认为拥有出众的男童音。

Born in Eisenach in 1685 to a musical family, he received an extensive early education and was considered to have an excellent boy soprano voice.

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巴赫于1685年生于艾森纳赫的一个音乐世家，他接受了全面的早教并被认为拥有出众的男童音。

Born in Eisenach in 1685 to a musical family, he received an extensive early education and was considered to have an excellent boy soprano voice.

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