单词	echelle
释义	echelle noun ā-ˈshel  : a diffraction grating made by ruling a plane metallic mirror with lines having a relatively wide spacing Example Sentences Recent Examples on the Web The echelle spectrograph for rocky exoplanets and stable spectroscopic observations (ESPRESSO) is an excellent tool to make these observations. Chris Lee, Ars Technica, 28 Apr. 2020 Word History Etymology French, literally, ladder, from Old French eschele First Known Use 1949, in the meaning defined above
随便看	radial velocity radial-flow radiale radialer radiales radialest radialia radialisation radialisations radialise radialised radialises radialising radializations radialized radializes radializing radialler radiallest radiallier radialliest radially radially symmetrical radials radian

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