VOA慢速英语:More Universities Offer Free Online Courses

短语讲解：

1. MOOCs are usually open to anyone and can have thousands of students around the world.

thousands of 成千上万,几千
例句：A computer consists of thousands of components. 
电脑由成千上万个部件组成。 

2. For example, this week the University of California, Berkeley, announced it has joined a noNPRofit enterprise called edX.

for example 例如
例句：For example, it can easily remember such things as: 
例如，它可以轻易地记住下面这些信息。 

3. In fact, some Berkeley professors have been teaching free courses through Coursera.

in fact 事实上
例句：In fact it requires at least n generators. 
事实上，它至少要有n个元素。 

4. Coursera started with four universities and last week announced a big expansion for the fall.

start with 以...开始
例句：Her illness started with a high fever.
她的病开始时是发高烧。