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古观象台是明清两代________，是世界上运行时间最长的天文台，也是世界上古代天文仪器数量最多而又保存最完整的古天文观测中心。

月坛的全称是，是与、、、并称“北京五坛”。

Dear Dr. Smith, Mr. Li Mingzhi who has just returned to China from your university informed me that you are considering the possibility of offering a Chinese language course to your students in the next academic year and may have an opening for a teacher of the Chinese language. I’m very much interested in such a position. I have been teaching Chinese literature and composition at college level since 1996. In the past three years, I have worked in summer programs, teaching the Chinese language and culture to students from English-speaking countries. As a result, I got to know well the common problems of these students and how to adapt teaching to achieve the best results. With years of intensive English training, I have no difficulty conducting classes in English and feel quite comfortable working with American students. Thank you very much for your consideration and I look forward to hearing from you. Sincerely yours, Zhang Huiyan Does the writer have difficulty in conducting classes in English______ .

硬件时钟通常分为两类：绝对时钟和相对时钟，其中【6】是必需的。