shí / yàn / shì / zhèng / zài / yán / jiū / qīng / yǎng / hùn / hé / qì / tǐ / de / rán / shāo / tè / xìng实验室正在研究氢氧混合气体的燃烧特性。The laboratory is studying the combustion properties of oxyhydrogen gas.