bi·fi·lar /(ˌ)baɪˈfaɪlɚ/
 雙線的


 bifilar
 雙股的


 Bi·fi·lar a.  Two-threaded; involving the use of two threads; as, bifilar suspension; a bifilar balance.
 Bifilar micrometer (often called a bifilar), an instrument form measuring minute distances or angles by means of two very minute threads (usually spider lines), one of which, at least, is movable; -- more commonly called a filar micrometer.

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 bifilar
      adj : having or using two filaments; "a bifilar suspension of a
            waving part of an instrument"