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重点讲解：
1. go up （价格、数量或水平）上涨，上升；
An average electric bill might go up $2 or $3 per month.
每月电费可能会平均增加两三美元。
2. a factor of (增长的)倍数；
The cost of butter quadrupled and bread prices increased by a factor of five.
黄油价格涨了4倍，面包价格涨了5倍。
3. insist on 坚持；
He insisted on his innocence.
他坚持说他是无辜的。
4. pay attention to 关心；注意；
More than ever before, the food industry is paying attention to young consumers.
食品工业比以往任何时候都更加关注年轻消费者。
n. 坚持，强调，坚决主张
