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2.例句：1. The betafitter is an important part of the team.
betafitter是团队中重要的一员。
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2.Betafitters are used to test the performance of new software.
betafitter用于测试新软件的性能。
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3. The betafitter was responsible for testing the software before it was released.
betafitter负责在软件发布前进行测试。