tpo里的句子,for which 这里就看不懂了,最后but这里开始分析下结构
tpo里的句子,for which 这里就看不懂了,最后but这里开始分析下结构
This “atmospheric engine,” invented by Thomas Savery and vastly improved by his partner Thomas Newcomen,embodied revolutionary principles,but it was so slow and wasteful of fuel that it could not be employed outside the coal mines for which it had been designed.中的句子for which it had been designed.看不懂