例句與造句

1. Compared to the Princess Royal Class, the main differences leading to increased power were a bigger boiler of great steam-raising capacity including a firebox heating surface of versus 217 sq ft, a flue heating surface of versus 2, 299 sq ft, superheater surface area of ( some sources say 822 sq ft ) versus 598 sq ft and a grate area of versus 45 sq ft . The steam passages were also better streamlined for sustained high speed running.
2. It's difficult to find firebox heating surface in a sentence. 用firebox heating surface造句挺難的