从地中海到黄海，更大更复杂的社会在第一个千年面对相似的挑战并找出相似的答案。
From the Mediterranean to the Yellow Sea, larger, more complex societies were facing similar challenges in the first millennium BC and finding similar answers.
管理外部的开发需要面对更大的挑战。
Managing external development can pose significant challenges.
新的学年，我们将面对更大的机遇和挑战。
The new school year, we will face even greater opportunities and challenges.
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