21世纪,人类面临的挑战是资源和环境问题。
In 21st century, the challenge that the mankind faces is resources and environmental problem.
值此世界无线电日,教科文组织呼吁每一个人都要重视无线电广播促进对话和倾听的强大作用,从而共同应对人类面临的挑战。
On World radio Day, UNESCO calls on everyone to nurture the power of radio to foster the conversations and the listening we need for cooperation to tackle the challenges all humanity faces.
当出现新的或困难的材料时,几乎所有的听众都面临着一个挑战,因为人类的语言缺乏印刷文字的稳定性和持久性。
When new or difficult material is presented, almost all listeners are faced with a challenge, because human's speech lacks the stability and permanence of the printed word.
Now there are challenges to a plant based diet which made eating meat important to humans in human history.
在人类历史上,以素食为主的饮食方式面临各种挑战,使得进食肉类变得重要
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