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背景：课程继续。

句末标点不用写

S:Now , remember , Newton realized that Aristotle was wrong.
   —1—.
   So let's plug in our 9.8 meters per second squared
   As "A" and we get
   Force -- Earth gravity - equals mass times 9.8 meters per second per second.
   So we can see that "ma" equals "mg"
   —2—?
P:Uh , we know that ... Newton was a really smart cookie.
   Oh!
   Is that where Fig Newtons come from?
S:No, Fig Newtons are named after a small town in Massachusetts.
   —3—!
P:Sorry.
S:Now , if "ma" equals "mg," what does that imply?
P:I don't know.
S:How can you not know?
   —4—.
   Have you suffered a recent blow to the head?
P:Hey!
   —5—!
S:I'm sorry.
   Have you suffered a recent blow to the head?