VOA慢速英语:When a Textbook Is Online, Not on Paper

work on致力于…
例句：He has been working on a new novel for over a year now.
近一年多来, 他一直在写一部新小说。

2. Usually it's in the neighborhood of between fifty and seventy dollars to buy a textbook for each student, which adds up to roughly eight million dollars for all of our students in Fairfax County.

add up to总计达, 总共是
例句：The money adds up to 100 dollars.
这笔钱总计达100美元。

3. I don't have to carry a textbook around, so that's nice.

carry around随身带, 携带
例句：I carry memories of my homeland around with me.
对家乡的回忆终日萦绕在我的脑际。

4. But the students also need access to the Internet when they are not at school.

access to接近或使用的机会
例句：Students need easy access to books.
学生需要得到借书的便利。

5. Next year we'll just have a pilot with probably one classroom and one subject area, so that we can see, you know, what issues will come up with complete online access.

come up发生；出现
例句：I expect something to come up soon.
我预料很快就要出事的。