flapgates造句

例句与造句

1. Wood was hired by the Sewerage & Water Board of New Orleans in 1899, to try to improve the flood-prone city's drainage, Wood invented " flapgates " and other hydraulic devices, most notably his efficient low-maintenance, high-volume pumps including the Wood Screw Pump ( 1913 ) and the Wood Trash Pump ( 1915 ).
2. It's difficult to find flapgates in a sentence. 用flapgates造句挺难的