gōng / chéng / shī / cè / liáng / le / shuǐ / bèng / de / wǎng / fù / yùn / dòng / pín / lǜ / , / yǐ / biàn / gǎi / jìn / shè / bèi / xìng / néng / 。工程师测量了水泵的往复运动频率,以便改进设备性能。The engineers measured the frequency of the pump's reciprocating motion to improve the equipment's performance.