yán / jiū / rén / yuán / zài / xiǎn / wēi / jìng / xià / guān / chá / dào / le / guǒ / yíng / tuò / yè / xiàn / zhōng / de / duō / xiàn / rǎn / sè / tǐ研究人员在显微镜下观察到了果蝇唾液腺中的多线染色体。Researchers observed polytene chromosomes in a fruit fly's salivary glands under a microscope.