yán / jiū / rén / yuán / zhèng / zài / cè / liáng / shí / yàn / shì / lǐ / yī / yǎng / huà / dàn / de / hán / liàng研究人员正在测量实验室里一氧化氮的含量。The researchers are measuring the amount of nitric oxide in the laboratory.