单词:friction welding machine
单词:friction welding machine 相关文章
Once there lived a woodcutter in a village in Arabia. His name was Ali Baba. He was very poor. One day he was cutting the trees beside a mountain near by. Suddenly he heard some hoofing sound. So he climbed up the tree to watch seriously and carefull
368. Progress of Invention. 368.发明方面的进展 The electric telegraph was now in common use. 此时电报已经投入日常使用, It enabled the newspapers to tell the people what was going on as they never had done before. 它使得报纸可
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