This is not the first time a replacement has been proposed for the current Internet.
这已经不是第一次提出更换当前的互联网了。
The filters become dirty after they are used for a long time necessitating replacement.
过滤器成为肮脏后，他们用相当长的时间需要更换。
The filters become dirty after they are used for a long time necessitating replacement.
过滤器成为肮脏后，他们用相当长的时间需要更换。
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