正如历史不断向我们展示的那样，新的技术也带来了新的挑战和机遇。
As history has continually shown us, with new technologies there also come new challenges and new opportunities.
认为绿色化学是21世纪的一个新课题，给化学工作者们提供了新的挑战和机遇。
The author thinks that green chemistry is a new subject in the 21st century and it provides new challenge and opportunity to chemistry workers.
新的历史时期，大学面临新的挑战和机遇。
In the new historical period, universities face with new opportunities and challenges.
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