bi·sect /ˈbaɪˌsɛkt, baɪˈ/
  (vt.)(vi.)切成兩分,對分
  bisect
  二等分
  Bi·sect v. t. [imp. & p. p. Bisected; p. pr. & vb. n. Bisecting.]
  1. To cut or divide into two parts.
  2. Geom. To divide into two equal parts.
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  bisect
       v : cut in half or cut in two; "bisect a line"