If you plan on going to USA: A change up is a deceptively slow pitch intended to throw off the batter's timing. (Sport of baseball)
Otherwise, go with the answer by Bob.
2015年8月29日
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Isabel, it's a very good question!
Thank you, Bob. It makes a lot of sense.
2015年8月28日
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Thank you very much Bob.
2015年8月28日
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Hello Isabel,
Change is a process where something does not remain constant. So a boy changes into a man. If you change up you are either moving from one gear to another when driving or sometimes it can mean that you are improving your situation.
Hope this helps
Bob