I.about [美 əˈbaʊt, 英 əˈbaʊt]副about often appears as the second element of certain verb structures in English (fool about, knock about, move about, etc). For translations, see the relevant verb entry (fool, knock, move, etc)
The advantage of circular polarization over linear polarization is that viewers are able to tilt their head and look about the theater naturally without seeing double or darkened images.