例句與造句

1. Flat belts on flat pulleys or drums were the most common method during the 19th and early 20th centuries.
2. Kampi Components Co . Inc ., Fairless Hills, won an $ 86, 298 contract from the Defense Supply Center, Columbus, Ohio, to provide flat pulleys.
3. A lot of experimenting was necessary to get the correct pulley size for the motor, as the range of standard size flat pulleys was limited.
4. It's difficult to find flat pulley in a sentence. 用flat pulley造句挺難的