为了正确地分类垃圾和保护环境，不同国家的人们正在使用不同的方法来分类他们的垃圾。
In order to sort the rubbish properly and protect the environment, people in different countries are using different methods to sort their waste.
中国许多其他城市也在使用这种方法来分类垃圾。
Many other Chinese cities are also using this way to sort their rubbish.
为此，他们需要一种方法来通过网关分类短信，然后过滤掉那些垃圾短信。
To do this, they needed a way to classify short messages received through a gateway and then filter out the rubbish or spam messages.
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