bi·lat·er·al /(ˌ)baɪˈlæt(ə)rəl/
 (a.)有兩面的,雙邊的,雙方的
 bi·lat·er·al /(ˈ)baɪˈlætərəl, ˈlætrəl/ 形容詞
 兩側的,左右的
 bilateral
 雙向 雙側
 Bi·lat·er·al a.
 1. Having two sides; arranged upon two sides; affecting two sides or two parties.
 2. Biol. Of or pertaining to the two sides of a central area or organ, or of a central axis; as, bilateral symmetry in animals, where there is a similarity of parts on the right and left sides of the body.
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 bilateral
      adj 1: having identical parts on each side of an axis [syn: isobilateral,
              bilaterally symmetrical, bilaterally symmetric]
      2: having two sides or parts [syn: two-sided] [ant: unilateral,
          multilateral]
      3: affecting or undertaken by two parties; "a bilateral
         agreement between the United States and Japan"