meaning for 往返 wǎngfǎn:

  • - to go back and forth
  • - to go to and fro
  • - round trip

zhèxiē这些
shì
wǎngfǎn往返
xiānggǎng香港
àomén澳门
jiān
de
dùlún渡轮

These are ferries that ply between Hong Kong and Macao.