shí / yàn / kāi / shǐ / qián / qǐng / xiān / jiǎn / chá / biàn / zǔ / qì / shì / fǒu / lián / jiē / zhèng / què

实验开始前，请先检查变阻器是否连接正确。

Before starting the experiment, please check that the variable resistor is connected correctly.