试验物

例句：

1. 1. The engineer tested the new machine before installing it in the factory.
   工程师在将新机器安装在工厂之前进行了测试。
2. 2. The scientist conducted a thorough test on the new drug to ensure its safety.
   科学家对新药进行了彻底的测试，以确保其安全。
3. 3. The company conducted a rigorous test of its new product before releasing it to the market.
   公司在推出新产品前对其进行了严格的测试。