随着人类进入新世纪，便迎来了知识经济时代。
As the new century has arrived, people are stepping into a knowledge economy epoch.
人类进入新世纪。
人类已进入新世纪。
随着新世纪的到来，人类社会进入了一个全新的时代。
Along with the coming of new century, our society enters a brand-new era.
我们进入新世纪以来，人类的活动开始变多。
After we step into the new century, the activities of human being are increasing.
我们进入新世纪以来，人类的活动开始变多。
After we step into the new century, the activities of human being are increasing.
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