extra-duty

See also: extra duty

English

extra-duty (not comparable)

(tennis) Describing a tennis ball having a thicker felt woven more loosely around the ball's core, designed for hard court surfaces such as asphalt or concrete.
- 2022 September 6, Matthew Futterman, “The Great U.S. Open Ball Debate of 2022”, in The New York Times‎:
  The men at the U.S. Open use what is known as an “extra-duty” ball, which means the felt on the outside of the ball is woven slightly more loosely than the “regular-duty” ball the women use. […] Extra-duty balls are the balls of choice for outdoor hardcourts, like those at the U.S. Open, except when they are not.
Coordinate term: regular-duty

单词	extra-duty
释义	extra-duty See also: extra duty English Alternative forms extra duty Adjective extra-duty (not comparable) (tennis) Describing a tennis ball having a thicker felt woven more loosely around the ball's core, designed for hard court surfaces such as asphalt or concrete. 2022 September 6, Matthew Futterman, “The Great U.S. Open Ball Debate of 2022”, in The New York Times‎: The men at the U.S. Open use what is known as an “extra-duty” ball, which means the felt on the outside of the ball is woven slightly more loosely than the “regular-duty” ball the women use. […] Extra-duty balls are the balls of choice for outdoor hardcourts, like those at the U.S. Open, except when they are not. Coordinate term: regular-duty
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