【TOEFL核心词汇】No.9 车床
Hints：只听写例句。前面的单词不用听写。注意有两个"——"符号。http://t1.g.hjfile.cn/listen/201212/201212011013132488404.mp3In the late sixteenth century the glass lathe was introduced, making it possible to ground several lenses at once and also to produce——as objects of curiosity——powerful, thick concave lenses.
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