例句與造句

1. 1881 tests on the production of insulated wire with patented vulcanized bitumen began at their new factory at Erith, Kent . 1882 Callender's Bitumen Telegraph and Waterproof Company was formed to finance the development of vulcanized bitumen.
2. 1881 tests on the production of insulated wire with patented vulcanized bitumen began at their new factory at Erith, Kent . 1882 Callender's Bitumen Telegraph and Waterproof Company was formed to finance the development of vulcanized bitumen.
3. It's difficult to find vulcanized bitumen in a sentence. 用vulcanized bitumen造句挺難的