fi·lar /ˈfaɪlɚ/ 形容詞
絲狀的
Fi·lar a. Of or pertaining to a thread or line; characterized by threads stretched across the field of view; as, a filar microscope; a filar micrometer.
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filar
adj : related to or having filaments especially across a field of
view; "afilar eyepiece"