a. 走来走去的, 来来往往的\nn. 来来往往, 往复

老师一边说话一边在教室前面来来回回的走动。

to-and-fro type vibrating screen

to-and-fro bottle rocker

to-and-fro type herbal medicine slicing machine

to-and-fro

to-and-fro system aerial ropeway

to-and-fro accentuated

to-and-fro sound