But he points out that technology has also made new music available to people all over the world twenty-four hours a day.

VOA: special.2010.07.19

And I will be available 3:30 to 4:30 today for office hours if someone wishes to drop in.

我今天3：30到4：30有空,你们有问题的话可以来找我。

麻省理工公开课 - 固态化学导论课程节选

for medical services or doctors are available because of 24 hours change.

因为24小时的值班制,人们可以随时接到代诊服务。

普林斯顿公开课 - 国际座谈会课程节选