shí / yàn / zhōng / lǎo / shī / tí / xǐng / wǒ / men / bú / yào / zhí / jiē / jiē / chù / qīng / yǎng / huà / nà

实验中，老师提醒我们不要直接接触氢氧化钠。

During the experiment, the teacher reminded us not to touch sodium hydroxide directly.