Carl still remember one afternoon in his first year when the professor took the students to the chemistry lab.

卡尔仍旧记得大一的一个下午，教授把学生们带到了化学实验室。

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The Ohio State University's Matthew "Dr. Fus" Stoltzfus' General Chemistry course enrolled over 100, 000 iTunes U students in the first year it was offered.

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The 150, 000 applicants each year must first pass exams in chemistry, physics and mathematics before they can sit for a second set of grueling analytical tests.

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