【难点讲解】

1. You can highlight main points by underling them.

你可以通过下划线来强调要点。

Highlight本来是美术术语"高光点"，指画面上最亮、最显著的地方。这里highlight作动词，表示"强调"。Main points指文章的要点。

这句话的结构是：do sth by doing sth, 表示通过做某事达到某个目的，例如：

He keeps fit by going to the gym twice a week.

The students enlarged their vocabulary by reading English Novels.

2. Is there such a thing as being big boned?

有没有"骨架大"这么回事？

介词短语as being big boned在句子中作定语，"being big boned"是动名词短语，作介词as的宾语。类似的句子还有：Her friends all speak of her as being sweet-tempered。

As也可以作关系代词，在限制性定语从句中常和such, the same, so连用; 在非限制性定语从句中代指主句的整个内容，例如：

Such exercises as he does are good for old people.

I hold the same view as the majority does.

He is a teacher, as is clear from his manner.

As was his wont(习惯), he cleared his throat before starting the lecture.

Big boned 指"骨架大的"。

3. Walking and riding your bike count, and so do school sports.

步行和骑自行车都有用，学校里的体育活动也有用。

Count除"计数，计算"的意思外还有"被视为、在...之列、有...作用"等意思。例如：

His opinions don't count.

Knowledge without common sense counts for little.

so do school sports是省略句，相当于：school sports also count.

4. When you sleep, your body prepares you for the day to come.

当你睡觉的时候，你的身体为新的一天做好准备。