The 30′s were not less invention-intensive bringing us the jet engine, helicopter, tea bags, sticky tape, ballpoint pen and the first photocopier.
30年代人们也有不少发明，如喷气发动机、直升机、泡茶袋、胶带、圆珠笔和第一台复印机。
The 30′s were not less invention-intensive bringing us the jet engine, helicopter, tea bags, sticky tape, ballpoint pen and the first photocopier.
30年代人们也有不少发明，如喷气发动机、直升机、泡茶袋、胶带、圆珠笔和第一台复印机。
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