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 researchers found that people touched surfaces in these public spaces about 3.3 times each hour, and their mouth or nose about 3.6 times each hour.