zài / zhèngshì / cèliáng / qián / jìshù / rényuán / xūyào / xiān / gěi / zhè / tái / yí / qì / dìng / biāo

在正式测量前，技术人员需要先给这台仪器定标。

Before the official measurements, the technicians need to calibrate this instrument first.