yán / jiū / rén / yuán / yòng / diàn / zǐ / xiǎn / wēi / jìng / guān / chá / sī / zhuàng / bìng / dú / de / xíng / tài研究人员用电子显微镜观察丝状病毒的形态。Researchers used an electron microscope to observe the shape of filoviruses.