cross section of an electron microscope
/ˈkɹɒs ˈsɛkʃən əvən ɪlˈɛktɹɒn ˈmaɪkɹəskˌəʊp/
n
意味：Electron microscope: it uses an electron beam (as opposed to light) to provide magnification that is markedly superior to that of an optical microscope.