现在开始上课。

Our class is beginning.

youdao

现在开始上课，周末结束了。

Let's get started. The weekend is over.

youdao

现在开始上课?首先我给大家讲个故事?。

Now let's begin our class. First of all, I'll tell you a story.

youdao

I thought I'd begin today-this is, by the way, the regular practice.

现在开始上课，顺便说一句，这是惯例。

耶鲁公开课 - 文学理论导论课程节选

Let's get started. A couple of announcements.

现在开始上课首先宣布一些事情。

麻省理工公开课 - 固态化学导论课程节选

Let's get started. The weekend is over.

现在开始上课，周末结束了。

麻省理工公开课 - 固态化学导论课程节选