名词
中文翻译：测试者
同义词：
['test subject', 'test subject', 'test subject例句：1. The engineer tested the new machine before it was put into production.（工程师在机器投入生产前对其进行了测试。）']
例句：
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1. The engineer tested the new machine before it was put into production.
工程师在机器投入生产前对其进行了测试。
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2.The scientist conducted a thorough test of the new drug on humans.
科学家对人类进行了新药的彻底测试。
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3.The company sent a sample of their product to a third-party tester for quality assurance.
公司向第三方测试机构发送了样品，以确保产品质量。