名词
中文翻译：投球测试器
同义词：
['pitcher', 'pitcher', 'pitch tester']
例句：
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1.The pitch tester was used to measure the pitch of the ball before it was thrown.
投球测试器被用来测量球在被抛出前的音高。
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2.The pitch tester was used by the baseball umpire to determine if the ball had hit the batter's bat.
投球测试器由棒球裁判使用来确定球是否击中了击球员的球棒。
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3.The pitch tester was used to ensure that the ball was in the correct position before it was thrown.
投球测试器被用来确保球在被抛出前处于正确的位置。