We all have the responsibility of maintaining a clean environment on the Internet.
我们每个人都应该自觉维护一个干净的网络环境。
You'll never clean up the Internet, and it's not even worth trying.
互联网是永远都清理不完的，甚至都不值得一试。
Fourth line of defense and maintenance, always clean out your temporary Internet files.
第四道防线保养，你总是清除因特网临时档案。
Fourth line of defense and maintenance, always clean out your temporary Internet files.
第四道防线保养，你总是清除因特网临时档案。
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