紴考题解释：许多人对21世纪持乐观的态度且认为这个世纪是人类做出积极改变的好机会。
Many people are optimistic about the 21st century and see it as an opportunity to make positive changes to the world.
紴考题解释：许多人对21世纪持乐观的态度且认为这个世纪是人类做出积极改变的好机会。
Many people are optimistic about the 21st century and see it as an opportunity to make positive changes to the world.
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