shíyàn / kāishǐ qián / lǎoshī / xiān / yòng / fútèjì / cèliáng / diànchí / liǎngduān / de / diànyā

实验开始前，老师先用伏特计测量电池两端的电压。

Before the experiment began, the teacher first used a voltmeter to measure the voltage across the battery.