动词短语
中文翻译：升级
同义词：
['upgrade', 'upgrade to', 'improve', "enhance例句：1. We've decided to trade up from our current model to a more expensive one.（我们决定从现有的模型升级到更贵的一个。）2. The new car has a better engine and better fuel efficiency than the old one.（这辆新车引擎更好，燃油效率更高，比旧车好。）"]
例句：
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1. We've decided to trade up from our current model to a more expensive one.
我们决定从现有的模型升级到更贵的一个。
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2. The new car has a better engine and better fuel efficiency than the old one.
这辆新车引擎更好，燃油效率更高，比旧车好。
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3.She traded up from a basic plan to a premium package.
她从基本计划升级到了高级套餐。