因为在关照上课时间调整之前她去了广州，现在无法赶返来。

Because she went to Guangzhou before being notified of the change in the class timetable, she is now unable to rush back.

梅尔·瑞戴尔，美国中学校长联盟的副董事，赞成推迟青少年学生的上课时间，但他说，大多数地区反对这一做法。

Mel Riddile, an associate director at the National Association of Secondary School Principals, favors later class times for teens but said most districts oppose it.

上课时间到了！

It's time for a lesson!

请不要在上课时间在走廊里闲逛。

Please don't loiter in the hallway during class hours.

学校限制在上课时间使用手机。

The school restricts the use of mobile phones during class hours.

学校的钟声标志着上课时间的开始。

The ring of the school bell marks the start of classes.

上课时间是每个星期五，直到学年结束。

The class is every Friday until the end of the school year.

学校喜欢在上课时间有家长联系电话。

The school likes to have a contact number for parents during school hours.

上课时间是半小时，但你必须在十分钟前到那里。

The lesson is half an hour but you have to be there 10 minutes before.

有趣的故事使上课时间过得很快。

Classes can be beguiled with interesting stories.