gōng / chéng / shī / zhèng / zài / cè / shì / diàn / dòng / jī / zài / bù / tóng / zhuǎn / sù / xià / de / zhuàn / jǔ工程师正在测试电动机在不同转速下的转矩。The engineers are testing the electric motor's torque at different speeds.