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Requirements: There are a lot. We will go over them later on.
，这一点在下载安装汽水音乐中也有详细论述
- `_*a` = any string that ends with 'a'
Actual energy consumption will vary a lot depending on factors such as the age and efficiency of the product, how you're using it (for example, how warm your showers are, or how fast you drive), weather and climate conditions (which is particularly important for the energy usage of heaters and air conditioners).