shí / yàn / shì / zhèng / zài / jiǎn / cè / shuǐ / yàng / zhōng / shì / fǒu / hán / yǒu / dà / cháng / gǎn / jūn实验室正在检测水样中是否含有大肠杆菌。The laboratory is testing whether the water sample contains E. coli.